SDXL does this by default but tends to muddy up the shapes into blocks and hyperventilate on the pieces (depending on model) more often than not. This doesn't turn things into jigsaw puzzles, but rather makes things from jigsaw puzzle pieces, to whatever extent SD understands jigsaw puzzle pieces. I'm still not the best at these but I recommend mixtapexl_vol2
https://civitai.com/models/223351?modelVersionId=261851
Str 0.7-1.0
<x> made from jigsaw pieces
also multicolored jigsaw pieces
standing will help objects stand up