tzoyoni. (pret. otzoyon.) freirse algo. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 153r. col. 1. Thanks to Joe Campbell for providing the transcription.
Frances Karttunen:
TZOYŌN(I) to fry, for water to boil away / freírse (M), se consume (el agua) por tanto hervir (T), se fríe (T). Frances Karttunen, An Analytical Dictionary of Nahuatl (Norman: University of Oklahoma Press, 1992), 320.