The photo below is a sampling of my various BTD Vikings. Even without drawing a reference line, the bald guy with the axe is noticeably (but not excessively) taller than the rest of the warriors. The archers were, I think, the slightest of all the BTD Vikings.
Vikings are perhaps the most ubiquitous ancient/medieval range of miniatures. They offer a lot of reward for collectors who like variation in their painting routine. Plus, they can often do double duty in fantasy gaming. That may explain why there are so many Viking manufacturers out there.
Here is a size comparison of the BTD Vikings with some other popular manufacturers. From left to right: Gripping Beast plastic hirdman, Gripping Beast metal (?), BTD and Crusader hirdman, Again, the barbarian Viking comes out the tallest.
On the last big Black Tree sale, I also purchased a few packs of Dark Age/Viking villagers. Below, a group of Viking elders (DA1011). It offers a nice social cross section, from a poor thrall to a well off village elder. The wealthy beardless gent on the right would make a more than passable Njal from the great Icelandic Saga.
The pack (DA1070) shown below is the only one to offer a female figure, and it was out of stock for quite awhile. Apparently, a mold was lost, but it is now available.
Finally, mixed pics from a couple of other packs that I have multiple copies. Useful for populating your village with artisans and workers.