From the Super Mario Wiki
Hot Lips is a creature resembling a Blargg that lives in lava in Super Mario World 2: Yoshi's Island, Yoshi's Island: Super Mario Advance 3 and Yoshi's Island DS. This creature spits a stream of lava out of its mouth to attack the Yoshi and Baby Mario (in a manner similar to that of the Spray Fish). If the Yoshi is hit with lava, he will be knocked out instantly. They can only be defeated with a POW Block, Eggs only stunning it for a few seconds.
Hot Lips reappears in Yoshi's New Island, but its lava stream no longer defeats. Instead, it causes Yoshi to drop Baby Mario as most other enemy attacks.
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