I'm particularly thinking about larger aircraft with more than two sets of main landing gear.
It's pretty obvious you would not want them to rotate while landing and take-off, but while taxiing around or being tugged, the drag caused by fixed axis wheels would be significant on tighter corners, and would leave rubber on the tarmac.
As such one would presumably want the wheels to track the turn.
That effect would be even worse for something like the Antonov 225... which I have no idea how they turn on the ground...
If they do somehow pivot, is there some sort of locking mechanism that is employed prior to take-off and landing.
Note this has nothing to do with crabbing for landing, but for ground maneuvers.