From the Super Mario Wiki
Windbags are brown, eggplant-like enemies that spew strong winds from Yoshi's Island DS. The strong wind blows four Nipper Spores out of a Watage Pakkun, which eventually land and become Nipper Plants. If egged, they will die, but a few seconds later, they will regenerate. Yoshi will bounce off it if he touches it, and it will faint for a bit.
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