From the Super Mario Wiki
Lemon Drops are enemies in the game Super Mario World 2: Yoshi's Island and Yoshi's Island: Super Mario Advance 3. They look like goopy, yellow gumdrops, and break off of Salvo the Slime when he is hit, but are not normal Slimes. Lemon Drops are only found in a few levels and are especially prominent in Salvo the Slime's Castle. Salvo the Slime is a Lemon Drop transformed into a Slime.
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