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 first 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.
Names in other languages
||From "kullern" (roll) and "Birdie" (The german name of Goonie)
- ^ Super Mario World 2: Yoshi's Island Nintendo Player's Guide. Page 126.