There's a pretty obvious nickname that needs to be more discussed more widely.
There's a fearsome animal that lives in North Dakota that would be a great mascot. If we review the criteria, we see that...
1. It's fierce and highly energetic and passionate.
2. It's native to North Dakota.
3. It's unique and highly marketable. No other known school has the name.
4. It's an adorable and cute mammal, which works well with marketing, mascots, etc.
5. It would be very recognizable for the school, which would aid in recruiting.
6. It's small, but ferocious for its size, which would match the brand of UND.
7. It complements the mascots of other nearby schools (Wolverines, Badgers, Gophers) while also being quite unique and much more cool.
8. It could work with the current color scheme.
9. If you put UND in front of it, you get a fun Machiavellian play on words.
I present to you The UND Ermines! Look at the fearsome yet adorable face on this killing machine! It would be true marketing genius to take this name. It works on every level.