Mostosti Vomitonus

In Super Mario World 2: Yoshi's Island, the Official Guide from Nintendo Power describes how the Yoshi franchise has different enemy classes. Of those, one of them is Mostosti Vomitonus. Enemies in the class Mostosti Vomitonus are able to be eaten, and give a Yoshi the ability to breathe fire. The only members in this group are Pyro Guys and Lava Bubbles.

Trivia

 * The name is a pseudo-scientific name corruption of "Most toasty vomit on us", referring to the fireballs the Yoshis spit out.