There are hacks to get Snow Leopard on PPC, but they're a recent development. https://forums.macrumors.com/threads/snow-leopard-on-unsupported-ppc-machines.2232

There are hacks to get Snow Leopard on PPC, but they're a recent development. https://forums.macrumors.com/threads/snow-leopard-on-unsupported-ppc-machines.2232031/ https://forums.macrumors.com/threads/snow-leopard-on-unsuppo... It is real Snow Leopard with a Snow Leopard kernel, but a lot of components are copied over from Leopard, and there are still a lot of issues. I'm not clear as to whether or not anyone has gotten graphics acceleration working, for example—it certainly doesn't work on most models.