The best way I tamed my own was to lead it into an old fashion trap(4x1 or 2). As long as you are out of reach from the creature standing from a pretty good distance, Deinosuchus will either go into a basking mode(it's head slightly tilted, very difficult to guess) or the easier when it's mouth opens wide, although sometimes be mindful if the mouth is not trembling as it means it will bite. The rest is simple, providing the food, run when it does an animation, wait, and repeat, your only enemy will either be time or other hostile dinosaurs