Stickers are available to download from the App Store to be used in the iMessage app. In total there are 41 stickers: 30 animated stickers for each Common Natural Monster in My Singing Monsters, and 11 stickers of various monsters that are styled like emojis.
Stickers are only available to those users who also have iOS 10 or higher on their device.
There are also stickers for users of the Official My Singing Monsters Discord Server. They are free for anyone on the server.
Shrubb, fist on its chin, sighing. Bored expression.
Oaktopus, happy, with a baseball in one tentacle (and one in its leaves) and a baseball mitt on its other tentacle. Constantly throws the ball in and out of the mitt.
Furcorn, holding a big heart with its toes, with a heart replacing its leaf, and hearts popping around it.
Dandidoo, buried in papers, wearing a worried expression.
Pango, quivering with its claws in its beak, eyes darting from left to right; worried expression.
Cybop, holding papers (containing instructions for building a Cybop) in its tail, with one paper flying around it in the breeze. Content/bored expression.
T-Rox, sweatbands on its legs and forehead, a dumbbell in front of it, as it does squats.
Bowgart, lovingly hugging its cello, with hearts popping around it.
Pummel pulling its tongues towards its mouth, with a "!" above its head, shocked expression.
Clamble waving goodbye, with a cymbal on a stick to look like a bindle.
Thumpies jumping up and bumping into each-other; a friendly gesture.
iOS Stickers used to be unlocked over time by leveling up in game, but in a later update they were all made available, and 11 more non-animated stickers were added.
Mimic is the only natural monster without a sticker, most likely because they may be done with stickers.