Mobs are entities which occasionally appear in PickCrafter, requiring the player to tap on them to earn a particular Block and/or other boosts. Excluding seasonal Mobs and variants, there are currently 7 types of Mobs.
Creeps
Creeps are Mobs which occasionally appear from the sides of the screen in every biome except the Ocean. All Creeps' spawn rate can be increased via the Mob Lure Skill or by wielding the Creep Pickaxe. To defeat one, the player must tap it multiple times when it appears from the edges of the screen. It will fade away and reappear if they are successful. Creeps require 3 round of tapping to be defeated. If the Creep Pickaxe is equipped, only one tap will be needed to explode it. The explosion instantly breaks several blocks, and the Creep will drop Gunpowder. Before Version 3.0, every time a Creep reappeared after being tapped, its sprite became smaller. They also required more rounds of tapping the later the biome is unlocked, with Creeps in the Plain needing 2 rounds, the Desert needing 3, the Tundra needing 4, and the Cave and further requiring 5.
In Version 1.0, they were called Creepers, and had a sprite that looked exactly like the texture of Minecraft's Creepers.
Chest Creeps
Chest Creeps are a variant of Creeps which carry Chests, which was first introduced in Version 3.0. Their Spawn rate can additional be raise by Mimic Bait Skill. They require 2 round of tapping, and reward the player with a Chest when defeated. Even though their sprite carries a Wooden Chest, they can give the player any Small Chest, including Seasonal Chests.
Discovery Wheel Fairy
The Discovery Wheel Fairy is a special Mob that appears rarely in any biome. It was first introduced in Version 3.0. It slowly hovers across the screen. To defeat it, the player must tap it multiple times. When defeated, a Discovery Wheel appears.
According to the official PickCrafter Twitter account, this Mob's name is Havi, and is named after FiveAmp's community manager.
Armor Creeps
In Version 3.8.3, after crafting the Dominating Device of Iron, Creeps gain three additional appearances. After appearing the first time, a second Creep will appear wearing iron armor, the third wears gold armor, and the last wears diamond armor. Each successive Creep is tougher, but generates a larger explosion.
Ocelots
Ocelots are Mobs which occasionally appear from the sides of the screen in the Jungle biome as a replacement for Creeps. Rather than defeating or destroying them, the player pet one to tame it. The player must tap it multiple times when it appears from the side. It will fade away and reappear elsewhere if they are successful. Ocelots require 4 rounds of tapping to be tamed. When tamed, it will increase the player's Critical percentage for 15 seconds. Prior to Version 3.0, they also dropped Gunpowder
Tumbleweeds
Tumbleweeds are Mobs which occasionally drift across the screen in the Mesa biome. To destroy one, the player must tap it multiple times. They yield Tumbleweed.
Starfish
Starfish are Mobs which occasionally float across the screen in the Ocean biome.They can also be spawned by using Coral Pickaxe or Heart Pickaxe. To destroy one, the player must tap it multiple times. They yield Starfish Shards.
Guardians
Guardians are Mobs which occasionally swim across the screen in the Ocean biome. To defeat one, the player must tap it multiple times. It will yield 3-7 Prismarine and 0-3 Pearls.
Asteroids
Asteroids are Mobs which occasionally drift across the screen in the Moon biome. To destroy one, the player must tap it multiple times. They yield Asteroid Shards, which are used to craft the Asteroid Key(2.0) and the Cosmic Power Cell(3.0)
Astronaut Creeps
Astronaut Creeps are a variant of Creeps which only appear on the Moon. They wear spacesuits and have unique sound effects. They also behave similarly to Creeps, but require 5 rounds of tapping instead of 3.
Martians
Martians are Mobs who only appears on Mars. When defeated by tapping on it, they drop Martian Emerald Piece, which can be used to craft the Martian Emerald
Volcanic Bat
Volcanic Bats are Mobs which occasionally drift across the screen in the Volcano biome. To destroy one, the player must tap it multiple times. They yield Tattered Wing.
Squirrels
Squirrels are Mobs which occasionally appear from the sides of the screen in the Twilight Forest biome as a replacement for Creeps. To destroy one, the player must tap it multiple times. They yield Acorn.
Endermens
The Enderman is a Mob that only appears in The End. If beaten, they will give Ender Essence usable to craft the Ender Mask.
Comets
Comets are Mobs which occasionally drift across the screen in the Sun biome. To destroy one, the player must tap it once. They yield Comet Dust.
Flying Clocks
Flying Clocks are Mobs from Chronos' Lair. When tapped on it, they slow time for a few seconds along with giving Clock Spring.
Void Walkers
Void Walkers are Mobs who spawns in The Void. When tapped on it, they make Statics on the Players' Screen. Once they're defeated, they give Walker Essence which can be used to craft the Walker Emerald.
Dark Figure
Unknown mob what can spawn after boss win.
Creeps (Seasonal\Event)
Meatloaf's Creeps
Meatloaf's Creeps are Mobs exclusive to Meatloaf's Party Event, which replace the appearance of Creeps. They look and sound similar to Meatloaf, behave like Creeps, and have an astronaut variant. When defeated, they drop Gunpowder, and one of the five event-exclusive blocks - Birthday Balloons, Party Horn, Confetti, Sparkler, and Pinata Stick. Defeating one triggers the appearance of Armor Creeps, but they will look like normal Creeps.
Witch Creeps
Witch Creeps are Mobs exclusive to the Spooky Event, which replace the appearance of Creeps. When defeated, they drop Gunpowder, Orange Spooky Candy, Red Spooky Candy, and Blue Spooky Candy.
Turkey Creeps
Turkey Creeps are Mobs exclusive to the Harvest Event, which replace the appearance of Creeps. When defeated, they drop Gunpowder and Pie Crust, along with one the followed blocks - Mashed Potatoes, Pecan, Cherry, Peach, and Turkey Slice.
Gingerbread-Monz
Gingerbread-Monz are Mobs exclusive to the Winter Event, and replace Creeps during the event. They behave similarly to Creeps, have unique sounds, and have an astronaut variant. When defeated, they explode to break blocks, and drop Gunpowder and Papa Klawz Badges.
They appeared in the 2014 through 2016 Winter Events, but were called Gingerbread Creeps, instead.
Santa Creeps
Santa Creeps are Creeps exclusive to the Winter Event. They carry one of the four toy collectibles during the Winter Event - Yeti Plushie, Pet Rock, Circadian Yo-yo, and Fiery Slingshot. They also drop Papa Klawz Badges
Leprechaun Creep
Leprechaun Creeps are Mobs exclusive to the Lucky Event, and replace Creeps during the event. They behave similarly to Creeps, have unique sounds. When defeated, they explode to break blocks, and drop Gunpowder and Golden Coins.
Leaves
Leaves are Mobs that appears during the Harvest Event, or by activating the Pickaxe Power of the Leaf Pickaxe. The player only need one tap to defeat them and earn Leaves.
Turkey
Turkeys are a Mob that can be spawned only during the Harvest Dinner Pickaxe's Pickaxe Power. When defeated, it drops Turkey Slices.
Heart Creep
Heart Creeps are Mobs exclusive to the Heart Seeker Event, and replace Creeps during the event. They behave similarly to Creeps, have unique sounds. When defeated, they explode to break blocks, and drop Gunpowder and Enchanted Arrow. The Golden Heart Creep is the same as the Heart Creep except it appears twice the normal size on screen and drops more Enchanted Arrow.