From the Super Mario Wiki
Watage Pakkun are obstacles in Yoshi's Island DS. They are dandelion-like flowers that are made up of four Nipper Spores. When blown by strong winds (usually caused by a Windbag), a Watage Pakkun releases its Nipper Spores into the air. The spores then fall to the ground and turn into Nipper Plants. An enemy referred to as "Nipper Dandelions" are mentioned briefly in Super Smash Bros. Ultimate, most likely alluding to this enemy.
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