a brocket or roe deer; a type of small deer with unusual antlers (see Molina, where perhaps corzo is meant for "roe deer"; and see the attestations)
"a little black-faced brocket (Coassus rufinus), the “temazatl” of the Aztecs, [has] small, unbranched antlers, or brockets , which stands twenty inches high at the withers...."
"a small, goat-sized brocket deer called temazatl"
Mazate o temazate le llaman al corzo americano (Mazama americana), pequeño venado de color rojizo, de agudos...."
"La cierva no tiene cuernos, quando es chiquillo, el ciervo, o la cierva, es pintado, de unas pintas blancas, espessos por todo el cuerpo. El temaçatl es cabra montesa." Libro 11, fol. 16, p. 170v.
temazatl = corzo