From the Super Mario Wiki
Hot Lips is a lava dinosaur 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 dinosaur 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. Hot Lips looks a lot like a Blargg; however, Hot Lips has pouter lips and larger eyes. They are invincible to all but a POW Block, and Eggs stun 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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