The Repto is mentioned twice in How to Speak Dragonese.
Physical Appearance[]
Reptos have been neither seen nor discussed, so nothing is known about them.
Appearances[]
How to Speak Dragonese[]
Reptos are mentioned as food dishes served to the Fat Consul.
“ | He was eating a light snack of double reptoburger with tomato-and-dormouse relish and popdragons on the side. | ” |
— How to Speak Dragonese |
It is possible that Reptos were not meant to be a specific dragon species at all, but rather referring to a burger made out of Reptiles (which dragons are considered in the Books).