Does any version of 10.5 offer Boot Camp for PowerPC Macs?

No. Boot Camp is only designed to work on Intel Macs, even though you can install 10.5 through 10.5.8 on Intel Macs the same as you can on PowerPC Macs (G4 867 Mhz, 1Ghz, and higher as well as G5s). Some have posted that they've read it comes with versions of 10.5. While partially true, it is not the entire story. If you have a PowerPC Mac, Boot Camp will not get installed. If your intent is to run Windows on a Mac, there are means other than Boot Camp available to do so, covered by this tip:

https://discussions.apple.com/docs/DOC-2741

2006 to 2019 Macs offer Boot Camp, and 2020 and later Macs do not either. Many third party solutions exist for all which are covered in the tip.