Baby Qurupeco Swarm (AKA Geese Swarm)

Swarm. The swarm can occupy another creature's space and vice versa, and the swarm can move through any opening large enough for a Small goose. The swarm can't regain hit points or gain temporary hit points.

Multiattack. The swarm of geese may make as many bite attacks equal to half your proficiency bonus rounded up per turn.

Bite. Melee Weapon Attack: +4 to hit, reach 5 ft., one target in the swarm's space. Hit: 7 (2d6) piercing damage, or 3 (1d6) piercing damage if the swarm has half of its hit points or fewer.

The Geese Swarm can take 3 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature's turn. The Geese Swarm regains spent legendary actions at the start of its turn.

Honk. The Geese Swarm, as a whole, can collectively honk at the target. This does not do anything specific, it's just funny.