Yes, DHAL is a Scrabble word!

Letter values in Scrabble US: D 2, H 4, A 1, L 1.

Is it a valid word?

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

tropical woody herb with showy yellow flowers and flat pods; much cultivated in the tropics

Also: pigeon pea, pigeon-pea plant, cajan pea, catjang pea, red gram, cajanus cajan.