From the Super Mario Wiki
Dizzy Dandies are flower head enemies who appear in every Yoshi's Island game to date. They resemble the collectible Smiley Flowers, also floating in midair, but with a mean expression. However, when Yoshi approaches them, they will drop to the ground rolling very quickly, squashing any enemies, and hurting Yoshi upon contact. They disappear after hitting a wall. Yoshi can also cause one to prematurely attack by shooting an egg at it from a distance.
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