Yes, ROBLES is a Scrabble word!

Letter values in Scrabble US: R 1, O 1, B 3, L 1, E 1, S 1.

Is it a valid word?

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

large tree of Trinidad and Guyana having odd-pinnate leaves and violet-scented axillary racemes of yellow flowers and long smooth pods; grown as a specimen in parks and large gardens
tall graceful deciduous California oak having leathery leaves and slender pointed acorns

Also: platymiscium trinitatis, california white oak, valley oak, valley white oak, quercus lobata.