Yes, STRAPPADO is a Scrabble word!

Letter values in Scrabble US: S 1, T 1, R 1, A 1, P 3, P 3, A 1, D 2, O 1.

Is it a valid word?

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

a form of torture in which the hands are tied behind a person's back and they are lifted off the ground by a rope tied to their wrists, then allowed to drop until their fall is checked with a jerk by the rope

Not playable in Scrabble US: STRAPADO.