They're usually found along the edge of the desert if you circle it you'll find a few. I tamed two on SE there as compared to the island where I found one and couldn't tame it. The map is wrong about the spawn points js.
When you try to tame these guys, go up to the back and bring at least 2 stacks of mejoberries. Also if you see one near an allo just get away from it, it has a 0% chance of living. Hope this helped if I’d did press ^ and thanks for having the time to read my tip
I usually build a simple fence foundation and railing pen to use for passive tames. Then I’ll just take an Argy or a Dino able to carry them and drop them into the pen. That way they cant run half way across the map. Up if this helps you (:
This stinking thing!!! So annoying!!! I was taming it on a cliff and I was a bit slow and it knocked me off. RIGHT INTO A SWAMP. I swear, while everything was eating me, sarcophagus, titanoboa and mega parana, I saw it laughing at me.