Fleeper

Fleepers are strange little critters from Yoshi's Island DS that are reminiscent of the Frog Pirates from Super Mario World 2: Yoshi's Island, but look and act differently. For one, they're yellow, and look more like fleas than actual frogs (which is probably how they got their names). Plus instead of lashing out their tongues in an attempt to steal the baby you're carrying, they instead attack by trying to jump on top of you. With their long back legs, they can jump up into the top screen!