Puffer

Puffers are creatures who inhabit Blargg's Boiler in Yoshi's Story. One also exists in the Magma Castle. They seem to be a cross between an elephant and an insect. 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.