Surprise Ball

A Surprise Ball (also known as a ! Ball) is a spherical block that the Baby Yoshis used during the events of Yoshi's Story. They looked a lot like ! Blocks, but were round in shape, and floated in mid air. To use it, the Yoshi must use its tongue on these objects, and they will be pulled in, and thrust upwards, ending up standing on top of it.

Trivia

 * Interestingly, the Surprise Ball looks a lot like a Pitfall from the Animal Crossing series, although the colors are reversed.