Thugly is the Cliff world's boss in Donkey Kong Country Returns and Donkey Kong Country Returns 3D. He appears in the level Thugly's Highrise, where he is hypnotized by Xylophone Tiki. He's presumably a sub-species or relative of Mugly because of his similar looks and attacks.
Thugly bears a striking resemblance to Mugly, however he has hot iron plates attached to his back and is purple in color. He has a more rounded snout and sharper horns as well. He also has a black tongue instead of a pink one.