Yup that’s a Shimano Hollowech BB, you need the BB cup tool to remove the cups and switch spacers. To pull the crank, loosen the 2 bolts, remove the preload cap (uses a special tool but you can get away with anything that fits in decently it’s only finger tight) don’t forget to lift the safety retainer tab, (just one side pops up).
The arm should slide right off, and then push on the spindle to remove the other side, it may require a very light tap with a soft mallet to get it moving.
I have the tool to remove the ‘nut’ on the pictured shimano cranks, but I’m assuming his fat bike cranks are different. I do have two different crank arm pullers if they are needed.
Oh yeah got confused there for a second I’m only talking about the crank/BB in the photo…Shimano doesn’t make fat bike cranksets or bb’s (100mm) so it might be entirely different.
Most likely a Sram GXP, the crank should be self extracting, same 16 spline bearing cup tool.
Thanks for lending the BB tools. Just swapped one spacer and adjusted the shifting and I easily use my granny again. Going to take it for a longer spin on Friday to get all my studs seated in my tires as I just finished up to but it looks like it will work just fine now.