Yes, PELTATE is a Scrabble word!

Letter values in Scrabble US: P 3, E 1, L 1, T 1, A 1, T 1, E 1.

Is it a valid word?

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

(of a leaf shape) round, with the stem attached near the center of the lower surface rather than the margin (as a nasturtium leaf for example)

Also: shield-shaped.