Liten Karin is a polska from Dalarna. There are many variations of it, some including a third part. It is one of the more popular Dala tunes that is used as a hambo (a generic polska dance enjoyed by Swedes and by afficianados of Swedish dancing).
“Little Karin” is the translation of the title. It may refer to an old Swedish folk song. One reference I have seen refers to another song, saying “lyrics not appropriate for print”.
In my search for YouTube videos of Liten Karin, I came upon many recordings of the old folk song in a minor key. The only videos I found of this tune were of an accordion player, and of a small amateur combo (accordion, flute, and two fiddles) playing at a dance. I have a link to that video here. In the video, note the one fiddler using her whole body to feel the [1_3, 1_3] rhythm, and the other mildly tapping her feet in the same time.
To the left is a photo of a sculpture in the town of Järvsö representing a couple dancing the hambo.