Bloat

From the Super Mario Wiki

Bloat is a bony member of the skeleton crew of the S.S. Chuckola who, despite lacking flesh, has still managed to become obese and wedge himself in a doorway. During the events of Mario & Luigi: Superstar Saga, Mario and Luigi must blast Bloat out of the way with dynamite.

[edit] Trivia

• According to his crewmates, he is an Ostaf, a term which the player can understand by reading it backwards.