He actually has 4 nostrils. 2 on one side 2 on the other. If you look closely at his nose you can see 2 nostrils.

OverJaw Pack - Freshwater He's the leader of Freshwater, he makes meetings, attacks, you name it he plans it. Due to his 4 nostrils *2 on one side, 2 one the other* he has enhanced smelling capabilities, he can smell almost all the prey Freshwater needs but doesn't tell where it is because if he did Freshwater would lose their instinct to explore to new areas in search of prey.