Both dwarves and river-elves cause rackets of the loud noise variety in The Hobbit.  OED gives it as possibily imitative

• 02.042 at what he called “all this dwarvish racket,”
• 09.029 Drat this dwarvish racket!’
• 09.064 and there was a merry racket down by the river.

“racket, n.2.” OED Online. Oxford University Press, March 2015. Web. 8 June 2015.