So in this book series I'm writing (link here if you want to know more about that), there is this planet called Ryu 108. The planet is made up of two continents. The southern continent is heavily forested and resembles Sweden. The northern continent is heavily glaciated and volcanic at the same time, resembling Iceland. Both continents are inhabited by a culture based on the Norse/Vikings, and have had Viking age technology for thousands of years.
The northern continent is home to vast herds of wooly mammoths, megaloceros, and wooly rhinos, with packs of mutant direwolves the size of small horses prowling around, along with the occasional cave bear or ice wyvern. Is it possible for the inhabitants of this planet to have domesticated at least a few of these creatures the way humans have domesticated horses or dogs? If so, what uses would a Norse-based society have for these creatures?