Puffer

Puffers are creatures who inhabit Blargg's Boiler in Yoshi's Story. One also exists in the Magma Castle. They seem to be some sort of elephant. They shoot balls of energy, which tend to light up the place. They are a favorite food of Light Blue and Yellow Yoshi.

Profiles and statistics
Just between you and me, they are Yellow and Light Blue Yoshis' favorite food.
 * Shogakukan guide: ここだけの話だけど、黄色と水色ヨッシーの大好物.