tecpintli. pulga. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 93v. col. 1. Thanks to Joe Campbell for providing the transcription.
Frances Karttunen:
TECPIN-TLI pl: -TIN ~ -MEH flea / pulga (M) M gives this both with and without the absolutive suffix -TLI. Frances Karttunen, An Analytical Dictionary of Nahuatl (Norman: University of Oklahoma Press, 1992), 217.