Cupcake

Regeneration. The cupcake regains 5 hit points at the start of its turn. If the cupcake takes acid damage, this trait doesn't function at the start of the troll's next turn.

Death Burst. When the Cupcake dies, it explodes in a burst of frosting, covering ground nearby. The area within 5 ft. of the cupcake becomes difficult terrain. Any creature that enters the area may use a bonus action to consume the frosting, gaining 2 (1d4) hit points and removing the frosting from that space. Frosting can alternatively be destroyed by any source of acid damage.

Sacrificial Lamb. Any time the Frosting Catapult action is taken, the cupcake loses 5 (2d4) hit points. This may occur multiple times in one turn.

Multiattack. The Cupcake can take one Punch action, or two Frosting Catapult actions.

Punch. Melee Weapon Attack: +2 to hit, reach 5 ft., one target. Hit: 4(1d4+2) bludgeoning damage.

Frosting Catapult. Ranged Weapon Attack: +4 to hit, range 30/120 ft., one target. Hit: restore 5 (1d6+2) hit points. On a miss, the frosting lands in a randomly chosen adjacent tile. Any creature can enter this space and use a bonus action to consume the frosting to heal 4 (1d4+2) hit points, clearing the space.