Third (and more) "ancient" civilizations for my Jungle regions?

[Bohandas]

Well, for the "living on mountain tops" thing, it's not exactly lizardy but Goliaths and Yak Folk fit the environment. Raptorans or Harpies, possibly, if you're okay with birds being cousins of lizards.

Of the lizardy races the kobolds would probably have worked best in the mountains since they're also dragony