FOG on a MAC
Server Install
It has been reported that the FOG server will run on a MAC without any issues.
Client Tutorial
Netbooting Apple Mac
Intel Macintoshs all use (U)EFI - where common PCs have a BIOS - to bootstrap and to some extend talk to hardware. Several different ways exist to make those Macs boot from network. Depending on your preference and setup choose whichever suites you.
Using stones
On startup (when you hear the sound, before Apple sign on the screen) you can hold down 'n' to boot from network. Apple uses a kind of special protocoll called NetBoot which is partly similar or includes DHCP protocol. But there is more to it. Find a detailed explanation here if you want to dig into it.