The Collaborative International Dictionary of English v.0.48:
Snarl \Snarl\, v. t. [imp. & p. p. Snarled; p. pr. & vvb. n. Snarling.] [Etymol. uncertain.] To form raised work upon the outer surface of (thin metal ware) by the repercussion of a snarling iron upon the inner surface. [1913 Webster]WordNet (r) 3.0 (2006):
snarled adj 1: tangled in knots or snarls; "a mass of knotted string"; "snarled thread" [syn: knotty, snarled, snarly]