Rockkrocs are a rare variety of Kremlings found only in the game Donkey Kong Country. They are a group of petrified Kritters which are possessed by Tiki force and causing terror in one of the mines, but they can be controlled by the Stop & Go Barrels.
They were common Kritters of the Kremling Krew who were digging in one of the mines at Monkey Mines in search of ore until they were buried. After being buried for a long time, they were resurrected as stone beings by Tiki Tong where they became completely mindless and crazy.
In Donkey Kong Country, Rockkrocs dwell in one section of Donkey Kong Island: the Monkey Mines; specifically, the stage Stop & Go Station. Rockkrocs were the main enemy in that stage (the only other being Klaptrap which was found in fewer numbers). Rockkroc's main method of attack is to rapidly run back and forth. Rockkrocs are completely invincible in the stage under green light; Donkey and Diddy Kong cannot avoid or attack them at all. Jumping over them merely leaves the two open for the Kroc to turn around and get them. The Kongs must utilize Stop & Go Barrels in order to stop them. By jumping on the Stop & Go Barrels, the area will turn red, indicating STOP and so will the Rockkrocs.
Stopping them only lasts for a short amount of time and, in most cases, being too slow results in an injured Kong. When stopped, the Rockkrocs grumble as if weakened and curl into a boulder-like ball to shield themselves (probably due to their hate of red light). Donkey Kong can use his Hand Slap to defeat a curled-up Rockkroc in the GBA version of Donkey Kong Country.