Yes, FRINGE is a Scrabble word!

Letter values in Scrabble US: F 4, R 1, I 1, N 1, G 2, E 1.

Is it a valid word?

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

the outside boundary or surface of something
a part of the city far removed from the center
one of the light or dark bands produced by the interference and diffraction of light
a social group holding marginal or extreme views
a border of hair that is cut short and hangs across the forehead
an ornamental border consisting of short lengths of hanging threads or tassels

Also: outer boundary, interference fringe.