Question: What undead creature from Norse mythology have two Royal Norwegian Navy ships been named for?
Sentence (from "Draugr"): The draugr or draug (Old Norse: "draugr" , plural draugar ; modern Icelandic: "draugur" , Faroese: "dreygur" and Danish, Swedish, and Norwegian: "draug" ), also called aptrganga or aptrgangr , literally "again-walker" (Icelandic: "afturganga" ) is an undead creature from Norse mythology.
Relevant evidence: Yes