I have not seen a model shared. You could probably raise and lower the various colours (or maybe just black) of the standard 2d effort ( https://gbatemp.net/threads/tempy-gbatemp-mascot-graphics.51083/page-2 ) on an extrusion type thing in a 3d modelling program to create a flat type thing.
If you wanted to though some of the intro to 3d modelling things for blender revolve (pun possibly intended) around making a face. Would not be too far out of the way to make tempy instead.