In the center map they spawn around the pond that's on the floating island. Pick up with a quetz and bring them to a taming pen. I'd only use oviraptor kibble and starve tame it a couple times. Knock it out during the day..let it wake up at night and knock it out again then feed it
Can be found in Carno island cave, south west lava cave, south east cave near Stonehenge, Central cave near volcano, and possibly others. They are very rare spawns but if checked regularly you can encounter them if looking to tame.