Never heard of the Mohawk talker. I guess the Navajos had better PR.
It wasn’t the language, but rather the training that made the code talkers so effective. The Japanese weren’t stupid. They picked up the chatter on the radios and correctly guessed that it was a native American language being spoken. They also held a few Navajos from among the American POW’s in the Philippines who confirmed that the language being spoken was Navajo. They just had little idea as to how their language was being adapted to military terminology.