Yes, VOLVOX is a Scrabble word!

Letter values in Scrabble US: V 4, O 1, L 1, V 4, O 1, X 8.

Is it a valid word?

VOLVOX is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

type genus of the Volvocaceae; minute pale green flagellates occurring in tiny spherical colonies; minute flagella rotate the colony about an axis

Also: genus volvox.