Folks, I believe we are talking about two different subjects here. Deer with "fangs" are actually maxillary teeth. Whitetails have them sometimes, one side or both. Its in the same place as ivories in elk, etc. I see them in a couple deer each year here, and have also seen them in caribou. Sometimes they protrude beyond the skin and gum/palate line, thats usually when I notice them best.

What the guy is asking...I think...is about mounting coyote jaws into an open mouth deer head. Chase catologs have a lot of crap like that in there...junk. Guys do it, in the name of novelty taxidermy.