From the Super Mario Wiki
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Glad Bob-ombs are an enemy found on Vibe Island in the game, Super Princess Peach. They are like regular Bob-ombs, only they tend to jump around more. They also appear to be singing a tune as they hop, showing off how glad they are. When they explode, they leave behind a puff of confetti. However, the confetti doesn't affect the gameplay.
According to the game's Glossary, it states that a Glad Bob-omb "Skips happily toward you. It explodes, so be careful!"