Correct and that's the word I should have used.
There are a number of very specific titles for the Tronfølger:
Crown Prince because there can only be one. And now also Kronprinsessen) who is (now) the oldest child of the monarch regardless of gender.
, who is a relative who is the nearest in line for the throne after the monarch.
Tronarvingen, who is the heir to the throne. Which pedantically speaking is not exactly the same as Tronfølgeren, which simply means the next to sit on the throne. A Tronfølger can in contrast to an (bloodline) heir be appointed by the Parliament, if there are no one else left in the Line of Succession. - They covered everything when they wrote down these paragraphs!
But of course that's for nerds.