Puffer-Cheep

Puffer-Cheeps are blue varieties of Cheep Cheeps which are found in the Oho Ocean Seabed during the events of Mario & Luigi: Superstar Saga. These Cheep Cheeps would attack at first by ramming into Mario or Luigi, who would have to jump to avoid or counter it. However, if damaged, the Puffer-Cheep would puff itself up, revealing spines that prevented the Mario Bros. from jumping on it. If the Puffer-Cheep was damaged again, it would revert back to its original form, which was simply called "Cheep-Cheep". If a Bro. touched it or the Puffer-Cheep touched a Bro., the plumbers might have become poisoned.

Trivia

 * The Puffer-Cheep greatly resembles real world pufferfish.