I found a picture of the ornaments on the roof
here. So it looks like a simple dragon head.
Several of the stave churces are placed on grounds from older churches. So there is a chance that the same spots have been used to worship both the Norse gods and the Christian God.
I like the second one too very much. Lom stave church had an other kind of tower until 1663, when the new one was added. It looks like the towers are added a bit later on several of the churches. Most churches have been under quite a lot of changes during the time, special the ones that was build before the reformation, as the catholic art was often removed and the interior changed a bit. The churches build in the early 1100-centry have a bit different looks than the ones build later.
You find the same type of church in Eriksberg in Sweden, but in stone. This church was abandoned in 1885, as they got a new one, but restored and later used again. This one was also build in the 11oo century. The Swedish king family probably belonged here in those days, and it's claimed that the king Knut Eriksson died here. Several of the European royalties is related to this family (in the books about Arn, Knut is Arn's friend, that was the reason I went there.).
I lived close to
Mære Church for a year when I was a student. Also a very old chuch in Norway. One of my teachers worked there, so we got a tour around with him, looking at things that isn't open to public usually. It was build in the same period as Lom (1150-1200), but on that spot they worshiped Norse gods too. It has been one church at the same place and two other buildings before that too.