Not yet.
FPC starts working on ppc. It will take some time before Lazarus will run on MacOS X.
2 things need to be done:
1) all endianness issues need to be solved. At this moment when reading for instance image formats, a BigEndian system is assumed. This means that pictures on a ppc (=LittleEndian) won't work
2) If you dont want a gtk look, an new interface has to be build for Aqua/Quartz.