[SOLAR_FIELDS]

How did you end up telling apart Danish from “other Nordic languages”?

It’s quite trivial as a layman American who has lived in Scandinavia to tell Danish apart for Swedish (one immediate dead giveaway is usage of ø in Danish vs ö in Swedish). But apparently Danish and Norwegian in written form are almost indistinguishable, so reliance on cultural usage of words must be necessary

[sundvor]

As a Norwegian, I was going to say wait for the Dane to open their mouth; it's apparent in roughly 1 picosecond.

But yeah this is probably with the written language/static imagery so please ignore, move along. :)

[Hublium]

Norwegian has the diphthongs "ei" and "øy", while Danish has "ej" and "øj". Though I don't know whether you can rely on that when looking at proper names (surnames, place names).