Very difficult to tame in PVE since you can’t pick it up and it’s every gator’s favorite snack. 9/10 Times you will find them getting eaten. I recommend taking a taming raft to the edges of the swamp near the ocean and using rare flowers to aggro it into your boat. Have a buddy scout with a flyer to find one. They have low health so be careful not to kill it. You might want to force feed to get the health back up after KO’d.
All these tips here tells you how to tame it... but what they fail to mention is the fact, you have to breed it on land, can’t move the egg and the baby HAVE to STAY IN THE WATER!! Don’t push the baby on land or it WILL EXPLODE!!!! I just watch my baby explode right before my eyes!!! Never have I seen a Dino exposed before!!!
They are skittish but not anywhere near faster than humans. They have low torpor and health, so tranq darts are recommended. Tamed like any carnivore, kibble is Archeopteryx. Can be found anywhere in and around the swamps.