Makuu

Makuu is the leader of the crocodiles that live in The Pride Lands, a minor character in the 2015 Disney Channel TV film The Lion Guard: Return of the Roar and will be an antagonist in it's 2016 follow-up series The Lion Guard.

The Lion Guard: Return of the Roar
Makuu makes a brief appearance in this film when Bunga jumps on his head. Makuu lifts himself out of the water in annoyance before growling at Kion, who is following suit.

The Lion Guard
In the teaser to the show's first episode The Rise of Makuu, Makuu is seen fighting the crocodiles' leader Pua, whilst being watched by a crowd of animals including Kion, Bunga, Beshte, Fuli, Kiara, Tiifu, Zuri, Simba and Nala. Makuu wins the battle and becomes the new leader of the crocodiles before being congratulated by Simba who then thanks Pua for his service as leader. Pua thanks the King before leaving (as it is tradition for the leader to leave the fleet if defeated). Makuu taunts Pua as he leaves (but Pua ignores him) before being chanted on by his fellow fleet members. Kion then wonders if Makuu's new appointment will bad news to The Pride Lands.