Coin Pouch Mimic

Shapechanger. The mimic can use its action to polymorph into an object or back into its true, amorphous form. Its statistics are the same in each form. Any equipment it is wearing or carrying isn't transformed. It reverts to its true form if it dies.

False Appearance (Object Form Only). While the mimic remains motionless, it is indistinguishable from an ordinary object.

Bite. Melee Weapon Attack: +3 to hit, reach 5 ft., 1 target. Hit: 1-2 piercing damage.

Unexpected Bite. When a creature unaware of the pouch mimic's true nature attempts to reach inside of it, the mimic makes one bite attack with advantage.