No, it's not. Mercuriceratops is known from two specimens, found from Judith River Formation and Dinosaur Park Formation. The crocodylian remains the paleontologists have found there include Albertochampsa, Leidyosuchus (which I had in mind), one undescribed specimen and Brachychampsa.
Deinosuchus remains have been found over in 10 US states, as south as Northern Mexico and as north as Montana. Theoretically it might have inhabited the same area as Mercuriceratops (and it lived around the same time), but I wanted to depict another animal.