Shapechanger. The mimic can use its action to polymorph into a cake 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.

Adhesive. The mimic adheres to anything that touches it. A Medium or smaller creature adhered to the mimic is also grappled by it (escape DC 11). Ability checks made to escape this grapple have disadvantage.

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

Grappler. The mimic has advantage on attack rolls against any creature grappled by it.

Icing on the Cake. A creature that ends its turn grappled by the mimic takes 2 (1d4) acid damage.

Pseudopod. Melee Weapon Attack: +3 to hit, reach 5 ft., one target. Hit: 3 (1d4 + 1) bludgeoning damage. If the mimic is in object form, the target is subjected to its Adhesive trait.

Bite. Melee Weapon Attack: +3 to hit, reach 5 ft., one target. Hit: 3 (1d4 + 1) piercing damage plus 2 (1d4) acid damage.

Icing (Recharge 5–6). The mimic sprays gooey acid from its mouth in a 15-foot cone. Each creature in that area must make a DC 10 Dexterity saving throw. On a failure, a creature takes 5 (2d4) acid damage and is coated with icing.  A creature coated with icing takes 2 (1d4) acid damage at the start of each of its turns, and suffers the effects of the slow spell.  A creature may attempt to wash off the icing by repeating the saving throw at the end of each of its turns, with advantage if is splashed with water, ending the effect on it on a success.  The prestidigitation spell or any spell brings can also end this effect on a target.

Smell of Cake (3/Day). The mimic releases a strong musk that targets all humanoids within 30 feet of it. Each target must succeed on a DC 11 Wisdom saving throw or be charmed by the mimic for 1 minute. A creature charmed in this way does nothing on its turn except move as close as it can to the mimic. A creature charmed by the mimic can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.