Wikipedia
Klenät, klena, klejne, kleina, kleyna, and fattigmann are all names for a fried pastry common in the Scandinavian and a number of other countries such as Lithuania where they are known as Žagarėliai. The name is related to klen, the Swedish term for "slender", but is originally of Low German origin, which may indicate that the pastry was originally German. It is made from flattened dough cut into small trapezoids. A slit is cut in the middle and then one end pulled through the slit to form a "knot". The kleina is then deep-fried in oil or another kind of fat.
In mainland Scandinavia, klenäter are traditionally eaten around Christmas, most commonly in the southern parts of Sweden, but also in Norway and Denmark, the Baltic states, as well as Northern Germany. They may be sprinkled with sugar. Icelandic kleinur are a very common everyday pastry, sold in bakeries (singly) and stores (in bags of ten or so) all around the country, and eaten plain.
The pastries are used as part of a Christmas game in Scandinavian culture. They are tied to a string and hung in an open doorway. The game requires two people to play, but a crowd must be present to enjoy. One participant must attempt to bite the kleina off the string, using only his or her mouth (no hands!), while the other participant manipulates the unadorned end of the string.