I only just discovered this thread, which was last added to in 2010, I think. I hope someone will find my contribution of interest.

"A Mighty Ship Was the Gundremar" was a favorite of mine as an elementary school student in the mid 1950s at the Ethical Culture School in New York. Our music teacher, Herdis Hanson, used an overhead projector and glass slides to show the lyrics on the wall above her piano. I have no information about Kathleen Davis, identified online as the writer, but Miss Hanson had been teaching at ECS since 1924, and I suspect the Davis song predates her tenure. The Martins and Norman Dello Joio were prominent on the New York music scene from the 1940s, and it seems likely they were translating the same Scandinavian "Skagramar" ballad as Davis.