Xalapa Museum - 2001 - According to the Museum, this is Mictlantecuhtli, a diety of the dead.

Per Wikipedia: Mictlantecuhtli (Nahuatl, meaning "Lord of Mictlan"), in Aztec mythology, was a god of the dead and the king of Mictlan (Chicunauhmictlan), the lowest and northernmost section of the underworld. He was one of the principal gods of the Aztecs and was the most prominent of several gods and goddesses of death and the underworld (see also Chalmecatl). The worship of Mictlantecuhtli sometimes involved ritual cannibalism, with human flesh being consumed in and around the temple.

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