Can only speak to my own experience, but I’m running 3.0 NNs on my Stooge and find them excellent in the mud.
I also ride a fatbike and took a couple of rides to adjust but found both tyre combos I’ve tried to be very good. Started off with VHs front and rear (which I liken to huge Swamp Things – my favourite ever mud tyre), but am now on Bud front, VH rear. It’s a great combo with the Bud having slightly better control out front.
The reason i took a couple of rides to adjust is that you do get an initial slide/float when you hit mud, but you are so stable on the big tyres you just ride it and wait for the bite.
Only caveat for all this would be that I’m riding forest trails and mountain tracks in the Highlands. If I wasn’t riding mountains I’d maybe have a different view.