|World(s)||Jolly Roger's Lagoon|
|Weakness|| Talon Torpedo, Grenade Eggs, Sonar Ping|
Swellbelly is a large blowfish enemy which inhabits the depths of Jolly Roger's Lagoon. It reacts to threats by puffing itself up to an enormous size, piercing anything that gets too close with the sharp spines that cover its body.
- Swellbellies are recycled from the Donkey Kong Country enemy "Puftup". The Swellbellies made their recent appearance on Sonic & Sega All Stars Racing Transformed as nameless Blowfish enemies who are items for race tracks based on that game.
Enemies from Banjo-Tooie