Yes, ERGOTS is a Scrabble word!

Letter values in Scrabble US: E 1, R 1, G 2, O 1, T 1, S 1.

Is it a valid word?

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

a plant disease caused by the ergot fungus
a fungus that infects various cereal plants forming compact black masses of branching filaments that replace many grains of the plant; source of medicinally important alkaloids and of lysergic acid

Also: claviceps purpurea.