The cryo frozen mascots are 3d prints.
The printer brand is likely either a Markforged or Onyx brand running their carbon fiber material. Both have a very similar appearance to those figures.
If you Google them, you can get 3d print file for about any mascot, or reasonable facsimile thereof.
Use your 3d software or slicer program to drop the mascot model into a block and TADA...mascot in carbonate.
He likely printed one before the season for every team Mizzou plays for a few bucks.
Also there are companies out there that will do the same if you lack the equipment.