the drain usually is 12 in from the wall

so whatever toilet you buy has to follow that. However, you can get a more rounded toilet that does not protrude as much. For example this one:

https://www.homedepot.com/p/Swiss-Madison-Sublime-II-1-Piece-1-1-1-6-GPF-Dual-Flush-Compact-24-in-Round-Toilet-in-Glossy-White-Seat-Included-SM-1T257/303804149

This is 24 inches deep, much shorter than the more standard depth of about 29 in.