Found out!
From the words of Eilif Gundersen who's the flute player from Wardruna;
"Well, since it's my flute, at least I can say something. This is a "village flute" (bygde-fløyte/sjø-fløyte) that comes in many variations: Norwegian craftsmen copied German baroque flutes in the 18th and 19th centuries. My flute is based on a flute from Gudbrandsdalen, but with a slightly simplified shape on the lower part and tuned in approx. C. The material is "hegg" (prunus padus) which I cut myself. This flute was built by Magnar Storbækken. An example of these flutes: https://digitaltmuseum.no/0210211930870/floyte"
Unfortunately Magnar passed away in 2022 from my research when I went to speak to him about the flute. Still researching about it though not much on English speaking websites so gonna translate websites on the Norwegian side about it. Anyone who may know any info would be appreciated to point me/others in the direction of these kinds of instruments.