From the Super Mario Wiki
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Boo Barrels act the same as Blast Barrels except that they vanish and reappear every few seconds, like the ropes of Donkey Kong Country 2. Each Boo Barrel faces in a set direction, which determines where Dixie and Kiddy get blasted at. The direction they face upon appearing is usually randomized, and thus, the Kongs will often have to time their entry just right to progress. They are also sometimes hazardous obstacles, as they can blast the Kongs into enemies. Such Boo Barrels must be passed while invisible.
In Donkey Kong Country 3, the Boo Barrels only appear in the KAOS Kore level, Creepy Caverns. They appear a little more often in Donkey Kong Land III, in three levels: Stalagmite Frights, Haunted Hollows, and Ghoulish Grotto.
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