My best advice is to have lead it to a clear area out of the swamp by itself. You don’t want any Dino’s nearby or it’ll be easily distracted and won’t open its mouth (I had my tribe mates clear out all the Dino’s). Also kibble / mutton is your best bet or it could really take a while.

These things are ravenous! They eat a TON both when raising and sitting out as adults. Keep that in mind.

Put food in last slot and feed it after it opens its mouth and hisses. It’ll chomp down if you do it right, sometimes the prompt doesn’t work but you can still feed it. Then run away and wait about 30sec and try again. If your not dying your doing it right. Good luck

Big Hank

For those curious, yes you can drop deinosuchus in a pen and still passive tame it. I just tamed a level 140 this way in ASA, using a quetzal to airlift. Pen was 3x3 and 2 walls high (I switched the walls to single doorways, don't know if that mattered). About half its body will clip out of the pen, so you can access the head without going inside the pen.

It would hiss, open its mouth, and I'd come up near its head from the side to feed it quickly. Once you're close enough to the head look back towards its neck/body a little to see the Feed prompt. It chomps down when you feed it, then tries to chase you. Just step away from the pen and wait for it to settle down. Wait for it to hiss and open its mouth again. Rinse and repeat.

Only issue I had was the gator sat there completely motionless for several minutes until I went near her and got her to aggro and move around a bit.

Ever wonder why no one uses anything but superior kibble?

BECAUSE IT TAKES HUNDREDS OF FOOD TO TAME WITH EVERYTHING ELSE.

Dododex lies

Hardly a challenge in a TEK suit. Feed it (while its jaws are open) and fly up in the air until it stops aggro on you and wait until it opens its mouth again..

If you plan on breeding these make sure you have plenty of meat they eat like gigas

Get a flyer(pteranodon is enough) and put meat in your last slot, and when it opens it's mouth while not attacking anything run to it and press E(you must be level 70 to tame it)

If your not looking to make a trap for this beast,the best thing to do is get your argy and land near as its mouth is opened(NOT WHEN IT IS CHARGING A GIGA BITE).I recommend full ghillie and have superior or better kibble.Crouch towards it and feed it near the mouth.If it doesn’t instantly tame run back to your argy and repeat.Hopes this helps!

Rates are incorrect took 52 Raw Prime Meat to tame a level 140 on small tribes. Finished tame was level 201.