Install Mac OS X Tiger alongside Mac OS X Snow Leopard?
Lion 10.7 was the first consumer Mac OS to be licensed for virtualisation [OS X Server 10.5 was actually the very first]

No Mac can boot natively on an OS from before it was manufactured, as the drivers to support that hardware weren't yet invented.

There is a distant chance you may be able to get Parallels [list is for current version, not compatible with Snow Leo anyway] to virtualise Tiger [even though it is against the EULA], but I would be doubtful.
VirtualBox supports Leo &amp; Snow Leo Server, not Tiger.

It might be simpler, if not cheaper, to get an old Mac that would run Tiger natively.