From the Super Mario Wiki
A Rotatable Barrel (also called Rotater Barrel, Rolling Barrel and Spinner Barrel) is a type of Barrel that appears in the game Donkey Kong Country 2: Diddy's Kong Quest for the SNES and Game Boy Advance, as well as in Donkey Kong Land for the original Game Boy. This kind of Barrel first appears in the level Barrel Bayou. Rotatable Barrels also appear in Donkey Kong Land 2, Donkey Kong Land III, DK: King of Swing, and DK: Jungle Climber.
Rotatable Barrels are similar to the Auto-Fire Barrel, although this type of Barrel can actually be rotated and fired in any direction. However, some of them have a time limit (indicated by a number that appears on the Barrel) to how long the Kongs can stay in the Barrel. After this limit, the Kongs will be launched automatically. In Donkey Kong Land 2, Donkey Kong Land III and DK: Jungle Climber, these barrels have no time limit.
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