RE: Who makes yam fries?
I just read that Ms Olympia (can't remember her name) eats em, I've never cooked them though.
I would just cut the yams into chips. Whisk up some egg whites and dip the chips in the whites. Place onto some cooking paper (sprayed with some olive oil spray) and cook in a hot oven until golden.
I might try it this weekend and get back to you...