Yes, LOOFAH is a Scrabble word!

Letter values in Scrabble US: L 1, O 1, O 1, F 4, A 1, H 4.

Is it a valid word?

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

the dried fibrous part of the fruit of a plant of the genus Luffa; used as a washing sponge or strainer
the loofah climber that has cylindrical fruit

Also: loufah sponge, vegetable sponge, luffa cylindrica.