I had one spawn in on Scorched Earth. On the mountain North West on the map just North of the Scar on the right. It is a rare spawn but apparently they do spawn in on other maps. I thought my game was broken when I found one cause I thought they were exclusively for Crystal Isles which I have yet to play so I Googled it and yeah its a rare spawn.

More Tropeognathus Taming & KO Tips