Is there an Elvish word for squirrel?
According to my latest information from Helmut W. Pesch, Das große Elbisch-Buch, Bastei-Lübbe 2009, there is no such word.
My best try is the Quenya word nornoyaulë (literally "oak cat", from norno "oak" and yaulë "cat", formed after a German dialectal word).