Aren't you hunting for the term, "onomatopoeia?" "Shirrgled" is surely an onomatopoeic term. English, as well as all other languages, is replete with such words. One that comes to mind is "cricket." In French, it's "cricri." A literary one is in Poe's poem, "The Bells," i.e. "...The tintinabulation of the bells bells bells bells..." Of course, Auel used the device in having Ayla, her heroine use onomatopoeia in naming her horse.