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Kannons are large cannon-wielding members of the Kremling Krew; they only appear in the games Donkey Kong Country 2: Diddy's Kong Quest and Donkey Kong Land 2. Kannons attack by shooting barrels or kannonballs at the Kongs in whatever direction they're facing, either forward or downward. Kannons can be found in several levels, but mostly underground areas. Despite being large and burly, Diddy Kong and Dixie Kong can easily defeat a Kannon with any attack method.
According to the instruction booklet, Kannons are simply Klumps trained to use such weapons. However, while normal Klumps wear army gear (green helmet, grenade belt, etc.) Kannons wear more of a pirate ensemble, such as earrings, a large belt, and a large black hat with a skull and cross-bones on it. Also, Kannons seem to have distinct ears.
In both games, Kannons first appear in the level Kannon's Klaim, which is named after them.
Donkey Kong Country 2
Instruction booklet descriptions
Names in other languages