From the Super Mario Wiki
When a Hefty Goonie gets swallowed and then spat out, it loses its wings and becomes a Bowling Goonie. Bowling Goonies roll around the level for their primary method of attack. They can be defeated with a ground pound. They only appear in Super Mario World 2: Yoshi's Island and its remake, Yoshi's Island: Super Mario Advance 3.
For some odd reason, Yoshi can eat Hefty Goonies, and yet he can't eat Bowling Goonies.
They also appeared in Yoshi's New Island.
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