Yes, FINGERBOARD is a Scrabble word!

Letter values in Scrabble US: F 4, I 1, N 1, G 2, E 1, R 1, B 3, O 1, A 1, R 1, D 2.

Is it a valid word?

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

a guidepost resembling a hand with a pointing index finger
a bank of keys on a musical instrument
a narrow strip of wood on the neck of some stringed instruments (violin or cello or guitar etc) where the strings are held against the wood with the fingers

Also: piano keyboard.