All these are "neo-folk" (synthesizers and stuff that imagines what music that we have no surviving sources for would sound like. Contrary to popular belief, there is no surviving music or tunings from Viking Age music. We have no idea what it would have sounded like.)

An actual Scandinavian folk band would be something like Svanevit, just a few people only playing traditional instruments and songs. Their album, Rikedom och gåvor is an arrangement of traditional songs from Skåne for traditional strings and wood instruments.

It's a different kind of Nordic folk music, but Jazz På Svenska (Jazz in Swedish) is one of my favourite records. Beautiful piano and double bass interpretations of old Swedish folk songs collected from all over the country.

Gjallarhorn, already a bit older.

Would I risk evisceration to say I just recently discovered Aurora’s music?

She’s a Norwegian singer, so she should qualify as Nordic. Not sure folk is the right label though. I’ve heard her music described as faerie pop, though it’s officially just pop. But it’s more than that. Like Björk, Sia, and maybe others, she has the weirdness factor as well.

Wardruna is my favorite.

does folk metal count? Tyr, Korpiklaani, Fintroll etc

Yes, I listen to some heilung songs like Traust and Norupo (got exposed to them from Senua too). Come to think of it, Skyrim is kinda nordic too although a bit more towards folklore. I'll be checking out Forndom, thanks for the recommendation.

I love the alt folk of Hedningarna!

There was a Nordic-folk-pop song that was a pretty big hit around '97 I think it was. I think I first heard it on NPR radio in the States, but it got play on other stations and presumably around the world.

I can hear it in my head easily, but don't remember the lyrics, singer or title. Female lead. Quirky song, sort of a 'Nordic rap' but with a sweet (not hard), playful edge to it. Actually, I think one fragment of the vocals was "can't you see..."

Pretty sure I have, depending on what counts. Eluviete, Burzum? Others I can't remember the names of?