topon. Isenmouthe, (lit.) Iron Jaws
Sindarin name of the Isenmouth, translated “Iron Jaws” (LotR/920) or “Iron Mouth” (RC/772, PE17/101). This name is a combination of carach “jaws” and angren “iron” (SA/carak).
Conceptual Development: This name was already N. Carach Angren when it first appeared in Lord of the Rings drafts from the 1940s (SD/33).