This list of mythical creatures that begin with this letter and I am constantly gathering information from each continent, and is continually being updated.
Kukwes (Mi'kmaq)
Kukwes is a kind of man-eating ogre from Mi'kmaq Indian folklore. The Kukwes are greedy, hairy, and sometimes described as having bear-like heads. The name "kukwes" is a diminutive form of Kuku, giant. So "kukwes" literally means something similar to "little giant".
Little is relative, though-- Kuku (usually spelled Gougou) is sometimes described as being taller than the highest pine trees, which would make it at least 150 feet tall. Kukwes are usually described as around 20-30 feet tall (large enough to carry children in a sack.) The huge giant was a cannibal, and covered with hair like a regular gorilla.