From what I know, TNT1&2 did support "Edge Anti-Aliasing" in older drivers; for sure in the orginal 1.XX series, but I believe it may have left out in the 2.XX series Dets and above. You will find this feature available in Nvidia reference drivers and some manufactures' driver sets, like Diamond.
This is not to be misunderstood as FSAA --- it's not nearly the same. Edge AA uses much less overhead to do it's job, although it's not nearly as effective as FSAA. But hey, if it can clear up the jaggies somewhat that's good. You may be able to mix and match up driver sets from 1.XX thru 5.XX, but 6.XX and higher must be left alone --- no go!
But as a final answer to the question --- TNT1&2 DO NOT/CANNOT SUPPORT FSAA ON THE CHIPSET! If you could find a way to trick the drivers into letting this option be available on a TNT, it would only FSAA in software mode, and speed would plummet into the single digits. I'm told that FSAA is a function of the T&L engine on the GPU, and since TNTs don't have T&L, we are left out!