Yes, LAMPREY is a Scrabble word!

Letter values in Scrabble US: L 1, A 1, M 3, P 3, R 1, E 1, Y 4.

Is it a valid word?

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

primitive eellike freshwater or anadromous cyclostome having round sucking mouth with a rasping tongue

Also: lamprey eel, lamper eel.