a grunter (a person or an animal who makes an animal sound) (see Molina)
IPAspelling:
kotɑloɑːni
Alonso de Molina:
cotaloani. gruñidor assi. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 24v. col. 1. Thanks to Joe Campbell for providing the transcription.