Not knowing which Sawtooth you have makes this a bit harder to reply on. If you look at this link, the Sawtooth series of macs came with OS9:
http://lowendmac.com/ppc/sawtooth-power-mac-g4-agp.html
While it is possible to run OSX on these machines, it does take a bit of work. It has been a few years since I sold my last Sawtooth, so I had to do a bit of google searching:
http://resale.headgap.com/osxnotesG4.html (This will at the very least get you started)
From what I remember on my G4/400 Sawtooth, maxed at 2 gigs of ram, 10.3.9 was SLOW to say the least. I didn't even attempt 10.4 with the issues of loading 9.2 first, bootstrap and what not, it was truly not worth the effort. Depending on what you want to do with this macs. Getting your hands on a copy of 9.2.2 or going the ljnux route might be the best option.
http://linuxtidbits.wordpress.com/2009/01/29/reviving-a-power-mac-g4-with-ubuntu -server/
http://mintppc.org/
I have had some good experiences with MintPPC on a few of my rigs here, I have been pleasently suprised that with the simple switch of an OS, you can achieve so much more.
Hope it helps
~Drake