Yes, IGUANID is a Scrabble word!

Letter values in Scrabble US: I 1, G 2, U 1, A 1, N 1, I 1, D 2.

Is it a valid word?

IGUANID is a valid word in the official Scrabble dictionary (US) and the UK Scrabble Dictionary, but not in Words with Friends (ENABLE).

lizards of the New World and Madagascar and some Pacific islands; typically having a long tail and bright throat patch in males

Also: iguanid lizard.