Heck yeah
The All Indian Rodeo Cowboys AssociationIndian Rodeo News
and:
American Indians also found employment as cowboys. In fact, many early vaqueros were Indian people trained to work for the Spanish missions in caring for the mission herds. Later, particularly after 1890, when American policy promoted "assimilation" of Indian people, some Indian boarding schools also taught ranching skills to Indian youth. Today, some Native Americans in the western United States own cattle and small ranches, and many are still employed as cowboys, especially on ranches located near Indian Reservations. The "Indian Cowboy" also became a commonplace sight on the rodeo circuit.
-- from Wikipedia's article on cowboys.
