Yes, UGLIES is a Scrabble word!

Letter values in Scrabble US: U 1, G 2, L 1, I 1, E 1, S 1.

Is it a valid word?

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

large sweet juicy hybrid between tangerine and grapefruit having a thick wrinkled skin

Also: ugli fruit.

Not playable in Scrabble US: UGLI.