Wait for it to lay down and open its mouth. Walk up to its mouth and feed it with meat. (I haven’t tested the kibble it likes yet but I assume it’s extraordinary) when you feed it, it will snap its jaws shut before getting back up, giving you a few seconds to back away.

I recommend bringing a ghillie suit and cactus broth if you can.

Make sure to run like hell the moment you feed it. Wear ghillie and give it superior kibble

I forgot to write this in my last tip, remember to crouch when sneaking up. - RUGER5264

They tame off of superior kibble

Once you find one, get it trapped where it can't see other dinos. Very aggro to everything else.

Once trapped, put on full ghillie. Put superior kibble (or meat of some kind) in last hotbar slot. Wait for it to bask (mouth wide open, not moving). Then walk up to sides of its mouth and look towards its neck. Feed then back off a bit. It will aggro to you after every feed. Wants feed basically right away when it basks again.

-AJ

Takes superior kibble to tame, just walk up with ghille and put in its mouth

I would recommend only using superior kibble to tame one because prime and mutton don’t give much percent even for low levels. I would suggest getting around 10 kibble for a high level and just get it away from anything because these guys attack everything. After that use some gillie and wait until the gator opens his mouth and approach it near the neck, and feed the kibble. After you feed back away and watch it walk around until it lays down again. The great thing is these guys won’t loose there taming progress or effectiveness if they agro to you. Repeat these steps and you will have yourself one of the greatest all rounded dino’s on the island!

Tried quetz pick up and had no luck.

This is exactly how I tamed the deino being a new ish player : used a ptero and Lured 2 deinos towards me (they aggro on almost anything that breathes with ended up one of them chasing a icthyornis far away) then hover above it waiting for it to start basking. When it open it's mouth, walk towards it feed your taming food and get the hell away. Repeat till u have a lil croccy boi :)