Wikipedia
In Aztec mythology, Tepēyōllōtl ("heart of the mountains"; also Tepeyollotli) was the god of earthquakes, echoes and jaguars. He is the god of the Eighth Hour of the Night, and is depicted as a jaguar leaping towards the sun. In the calendar, Tepeyollotl rules over both the third day, Calli (house), and the third trecena, 1-Mazatl (deer). He is the eighth Lord of the Night.
The word is derived as a compound of the Nahuatl words ("mountain"), and ("heart" or "interior"). Tepeyollotl is usually depicted as cross-eyed holding the typical white staff with green feathers. Sometimes Tezcatlipoca wore Tepeyollotl for an animal skin or disguise to trick other gods into not knowing who he was. It's safe to say, Tepeyollotl is no more than a nahual for Tezcatlipoca