From the Super Mario Wiki
Jumping Bloopers are jellyfish-like Bloopers that appear only in Super Mario Sunshine, which are found solely in Ricco Harbor. They occasionally jump out of the water, leaving them susceptible to being sprayed by F.L.U.D.D.. When sprayed, they land on the water and flatten. They can be used as platforms in this condition and thus are useful in helping Mario cross toxic water. Mario must cross quickly however, as they revert to their normal form after about fifteen seconds. They never move in any direction horizontally and only jump up vertically.
In a few episodes, boats filled with dead Bloopers and Jumping Bloopers can be found near the beginning of the stage; here, Jumping Bloopers are found in colors other than cream, such as white and reddish.
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