Warthogs have a big dark patch of fur on their back and on the tip of their tail, while the rest of the body is of a lighter shade of brown and with less visible fur. They have a long tail and really small and skinny legs.
A mutant character inspired by the warthog was supposed to appear in the first game, but was later turned into a normal animal enemy.
Warthogs appear again in the track Tiny Temple, from Crash Nitro Kart, in the background hills. They seem to look just like the old Warthogs and they just stand around looking at the racers pass by.
In Crash Bandicoot, they first appear as animals that Crash can ride on top of in the levels Hog Wild and Whole Hog to reach the end of the level, dodging spike pillars, natives and other Warthogs being roasted on moving sticks. Warthogs appear also as enemies in the levels set on the collapsing old bridges. They run back and forth and are impossible to defeat.
Sometime this animal is confused for the Wild Boar, but anatomical difference, such as the fur and fangs, can help distinguish the two species.
They seem to be able to walk on thin air but that is probably so that programmers wouldn't have to code jumping mechanics on this simple enemies.
In Crash Bandicoot: The Wrath of Cortex, in the level Jungle Rumble, a Warthog was originally meant to chase Crash along with several other mammals. Its AI (Artificial Intelligence) is missing, so it cannot make any movement or pursue Crash in a recreation of the original idea for the stampede chase.
A Warthog was supposed to appear in the cancelled game Crash Landed.