Buggy

Buggy is one of three critters that occasionally spawn in the Jungle or Underground Jungle biome when a player breaks a background plant (using any pickaxe or drill), the others being Sluggy (more common) and Grubby (most common). Buggy is the rarest of the three. It can be caught with any type of Bug Net, and used as bait with Bait Power.

Unsurprisingly, as Buggy is the rarest, it is the only one with a rarity, while Sluggy and Grubby have  rarities.