I'm by no means an expert, but I don't imagine that there would be a unique name for "Admiral" or "Captain" in the Dano-Norwegian Navy besides the translations that one could easily obtain through Google Translate. A bit of digging has turned up that in the modern Danish Navy, the equivalent of Admiral at OF-9 is termed the Chief of Defense, but that's not a day to day position as I understand it. OF-7 is an active position, and is termed Kontreadmiral, the same as it is the modern Norwegian Navy. If you're looking for a special post to fit the role of a special unit, i.e. Great Admiral, I suppose the former would be more appropriate. What special traits have you come up with?