Foetodon

Foetodon is a fictional species of large predatory reptile that appears in the 2005 film King Kong and the 2021 MonsterVerse film Godzilla vs. Kong. They are crocodilian denizens of Skull Island in the former and unclassified reptiles from Hollow Earth in the latter.

Ecology
Despite being land-based predators, the Foetodons in King Kong sported a large and powerful tail that was necessary for their largely aquatic young. On land, their powerful back legs launched them forward out of dug-out covered pits along jungle game trails to crush whatever prey came near with their horrible jaws. Their place as ambush predators was necessitated by their poor eyesight. Because of this, Foetodons were not particular in their prey and would attack whatever came their way, depending on their powerful bite to take it down.

They were not built for sustained speed, but they could surge forth and disable prey with immense speed and power. Their bite could shatter bones, meaning that even in the off chance that their first bite did not kill, their prey would still be unable to escape. Their strong sense of smell allowed them to easily track wounded prey. They also fed on invertebrates in the leaf litter, which juvenile Foetodons fed on exclusively. The layers of rotting vegetable matter also provided young Foetodons security from other predators and adults of their species.

Godzilla vs. Kong
As Arachno-claws scattered in Kong's wake, a Foetodon seized the opportunity, snatching up one crab in its jaws. Eight more Foetodons steered clear of Kong as he continued running.

Physical abilities
In Godzilla vs. Kong, a Foetodon easily caught an Arachno-claw in its jaws and crushed it. They use their tails as clubs to kill smaller creatures that irritate them.