Cranky's Kong Barrel
From the Super Mario Wiki
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Cranky's Kong Barrels, also known as Kong Barrels, are barrels that contain the moves Cranky can teach each Kong. Once a Kong hops into this barrel, Crystal Coconuts are the only thing that can keep its move alive. Kong barrels have so far only appeared in Donkey Kong 64. According to the manual, Cranky Kong built them.