From the Super Mario Wiki
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Party Balls are round capsules that appear in Yoshi's Crafted World. Their design is based on a Piranha Plant. They appear in the level Jumping to Victory. Party Balls hang from the top of the screen, and can be used as platforms by Yoshi. They come in two colors: red and blue. Red Party Balls contain objects such as eggs or Coins. Blue ones do not contain anything and are mainly used as platforms. Party Balls sometimes move up and down. Spike the Piranha starts out as a red Party Ball.
A rare blue Party Ball costume can be randomly obtained at Acorn Forest for 200 Coins. No costume exists for a red one.