Had concepts for these way before the creature class types update so decided to revamp them. (Made using https://jwatoolbox.com/)
For Mjaungdarhino, it’s decent. I would remove the Rend and Bleed resistances though, and reclassify it as a Fierce Resilient.
For Tryogamma, it’s actually pretty good. Only thing I would change is GT to either Group Ferocity or RtC.