I don't hate calling it the "Duck." Calling it the Husker seems too forced.
Personally, I'd like calling it something completely different from either of those. Something like Cowboy, Bandit, Robber, Sheriff, etc. Obviously don't name it something that another conference team uses as a mascot like Badger, Hawkeye or Wolverine.
Only defenses get to use such names. Offensive positions are letters.