The VOIDRUNNER'S CODEX is coming! Explore new worlds, fight oppressive empires, fend off fearsome aliens, and wield deadly psionics with this comprehensive boxed set expansion for 5E and A5E!
The scalykind domain is also found in Deities & Demigods. Exactly the same as the one in the FRCS.
Also, you could maybe look at Sean K. Reynolds's Serpent Archer. Not really a controller per se, but it could be used as a nice cohort for your reptile controller.