From the Super Mario Wiki
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Bon-Boms are enemies that only appear in Yoshi's Crafted World. They are blue sentient bombs with a Tap-Tap-like face, and they move around by bouncing. They appear in the level Mine-Cart Cave, where they are the most prominent enemy. Once they spot Yoshi, they immediately light their fuse and chase after him, exploding a few seconds later. Though they are immune to most of Yoshi's direct attacks, Yoshi can eat them and spit them out to cause them to explode in certain areas, such as obstructing rocks.