... the mythical kernel of the strophe is as follows:  The elf of the Morkwood of Hlodyn, the cold-hard storm-watcher, tested his power with frost-weather when he fought with Njord and his kinsmen.
    The Hlodyn of the Morkwood—that is to say, the goddess of the Jotunheim woods—is in this connection Thjasse's daughter Skade, who, in Haleygjatal, is called Járnvidja of Járnviðr, the Ironwood, which is identical with the Morkwood (Darkwood).  Thjasse himself, whose father is called "a perjurous hapt" in Thorsdrapa, is here called an elf. (Teutonic Mythology: Gods and Goddesses of the Northland, Rydberg-Anderson, v.3, 1905).