Quite so. However my guess is that they were made by the elf who is named Rog in the Book of Lost Tales. He was one of the Twelve Captains of Gondolin as Lord of the House of the Hammer of Wrath, he was a weapon-smith.

CJRT dropped a brief reference to Rog from the published Silmarillion on the, entirely reasonable, grounds that his father would not have retained "Rog" as the name of a Lord of the Eldar (it means "demon" in Sindarin).

When Tolkien wrote the unfinished "Tuor and the Fall of Gondolin" story that appears in Unfinished tales he had the Book of Lost Tales open in front of him. So Rog would almost certainly have made it into the final story (under a different name).

I suspect, had the story been finished, we would have seen one of either Glamdring or Orcrist in the hand of Rog, and the other in the hand of Turgon the King.