Deinosuchus was a giant relative of the alligator that lived in North America during the Cretaceous period and probably hunted hadrosaurs. Despite its appearance and name, Deinosuchus was more closely related to alligators than to crocodiles. It is estimated to have been 12 meters (40 ft) long and much larger than modern alligators, they are believed to have had lifespans of eighty years, far longer than most dinosaurs. Deinosuchus is sometimes referred to as Phobosuchus.
During the movie while Eli Mills presents the Indoraptor via hologram, the Indominus rex hologram shows that it had Deinosuchus DNA used for the number of teeth it has. This likely hints that the Indominus rex also had Deinosuchus DNA acquired by InGen for the hybrid.
It was only encountered in the arcade The Lost World: Jurassic Park game in the second stage, "The King of the Lakeside" as the second boss. As the players arrive in the lake on Site B, they fight off a pack of Velociraptors only to have the Deinosuchus attack and devour a raptor. After a few shots, the player(s) defeats the beast only in seconds another Deinosuchus appear, however it is easily defeated, with only a few shots.
It is also one of the animals available in Jurassic Park: Builder. For some reason, it is located in the Glacier Park alongside Cenozoic animals, despite being a Mesozoic semi-aquatic creature and native to tropical climates. It also more closely resembles Sarcosuchus in appearance. It also seems to completely lack osteoderms on its' body.
A Deinosuchus toy was meant to appear in the Jurassic Park: Junior toy line in a playset with Ichthyosaurus, and even made it to prototype stage, but was cancelled for unknown reasons.