Yes, RUCKLED is a Scrabble word!

Letter values in Scrabble US: R 1, U 1, C 3, K 5, L 1, E 1, D 2.

Is it a valid word?

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

make a hoarse, rattling sound
make wrinkles or creases on a smooth surface; make a pressed, folded or wrinkled line in

Also: scrunch up.