From the Super Mario Wiki, the Mario encyclopedia
Bubble Dayzees are purple Crazee Dayzees in Super Mario World 2: Yoshi's Island, that will walk a short distance and then blow out bubbles, similar to Barney Bubble. They only appear in two levels in said game: Watch Out For Lakitu and in Goonie Rides!.
Yoshi can eat the bubbles and then spit them back out to destroy almost any enemy. He can also bounce off of them to reach greater heights, but the bubbles he touches will pop in the process. Once Yoshi blows them out he will have to lick up another to keep the weapon. The bubbles can only run out if they all pop and the Bubble Dayzee is gone.
Bubble Dayzees reappear in Yoshi's New Island. Unlike previously, Yoshi cannot grab bubbles that a Bubble Dayzee spits out.
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