From the Super Mario Wiki
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These enemies are always seen bouncing on springy objects, such as elastic drapes and jelly blocks. Their jump height as well as trajectory may differ from individual to individual. Some Bouncy Tucks perform short bounces in place, while other perform higher bounces while flapping their flippers. Other Bouncy Tucks follow an arc-shaped motion while jumping.
Compared to other Snowmad enemies, Bouncy Tucks are rather uncommon in the game. A single Bouncy Tucks can be found inside a windmill in the level, Windmill Hills. However, more Bouncy Tucks can be spotted in Jelly Jamboree. The different types of jelly blocks that appear in the level do not influece their jump height as they do with the Kongs. However, like the Kongs, Bouncy Tucks are able to use blue jelly blocks to move certain mechanisms.