Chukka are furry critters that wander the Crater Rim area. Although they have no contract, they can be butchered for chukka pelts and raw meat. Chukka pelts are used to make Armordillo plate jackets among other things.
The chukka have a den NE of the Redneck encampment where you can fight Chukka Kahn, their leader. You don't get anything special for killing him, however.