It is a bipedal crocodile-like Pokémon that is similar in many ways to its pre-evolution. Its body is the same shade of tan; it has a pink belly, with black striping showing through. It has become a biped, unlike its quadrupedal pre-evolution. Its tail is longer, and there are spikes along its spine. Its nostrils are more proportioned to the rest of the face than its pre-evolution, and its hind claws are now white. It has three clawed toes on each leg, and its teeth are more prominent, even when the mouth is closed. Its arms are less muscular now, presumably due to walking on only its back legs.
No other Pokémon shares the same type combination as Krokorok and its evolutionary relatives. As a result, they are the only Pokémon to receive STAB from the famous Earthquake-Crunch attack combination.
Krokorok was first revealed in the United States (along with many other non-released Pokémon) through pictures leaked onto Serebii.net by Japanese players who received their copies of Black and White early.
Krokorok's design appears to be based on both that of a crocodile, and possibly the on the Baryonyx, a fish-eating, slender-snouted dinosaur which heavily resembled a crocodilian. More specifically, this Pokémon is likely based on a Nile crocodile or a literal interpretation of the mugger crocodile, an actual species of crocodile.
Krokorok's Englsh name is a combination of corruptions of the words "crocodile" and "rock" (due to its Ground typing).