The easiest way to tame these guys is by actually letting it grab you from off your mount and shoot it with arrows or darts. Just make sure that you have atleast have really good chitin armor or flack. Space your shots so that it doesn't kill the thing, because they leave low health, even for high levels. I recommend taking a Baryonyx as a mount unless you have something similar that can stand in the swamp water because you can drown. Doesn't take much to take these guys, just be careful and make sure to get them out of there asap because low hp. Have fun with the gator dog.
So I kinda wanted to tame one so I went to grab one with my argy…
He grabbed me off the argys back fell into the water with him I pulled out my sword and killed him then all the STUIPED TORPOR DEALING SNAKES CAME AT ME I made it out alive but I almost drowned while I was knocked out I made it to my nearest outpost from there I grabbed my pteranodon and flew to whistle my argy and flew home
PS: it is useful to have outposts where you can retreat also the outposts should have a flyer and supplies. I have 1 in redwoods 2 next to diff parts of swamp and some others through the map
I have tamed two of these if you have a sarco you can use it by clearing out the area and it is easier if it is attacking a snail clear out the trees because it would be a lot easier to shoot all you need is a bow and arrow use tranq arrows and then start shooting it I would take about 10 15 tranq arrows then once it is knocked out put about 60 meat in its inventory and wait about 2,3,4 minutes and you have a kaprosuchus I have a level 74 and 48 it’s jump attack is it’s strongest attack I hope this was helpful