Yes, NOBBLED is a Scrabble word!

Letter values in Scrabble US: N 1, O 1, B 3, B 3, L 1, E 1, D 2.

Is it a valid word?

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

deprive of by deceit
make off with belongings of others
take away to an undisclosed location against their will and usually in order to extract a ransom
disable by drugging

Also: short-change.