tapayaxin.

Headword: 
tapayaxin.
Principal English Translation: 

a salamander or a chameleon

IPAspelling: 
tɑpɑjɑʃin
Alonso de Molina: 

tapayaxin. cierta sauandija como salamanquesa.
Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 91r. col. 1. Thanks to Joe Campbell for providing the transcription.

Attestations from sources in English: 

Muchin quimomolchioa in tapayaxin nicaci. Iquac mitoa: in aca itla tequitilo, in amo oui: cenca couica itta. = He makes a stew of all the chameleons he catches. This is said when someone is given a task to do that is not difficult, but he regards it as difficult.
Thelma D. Sullivan, "Nahuatl Proverbs, Conundrums, and Metaphors, Collected by Sahagún," Estudios de Cultura Náhuatl 4 (1963), 124–125.