If we can get back to the original suggestion, I think it actually is a pretty good idea to set up some disambiguation. For instance, for "Swallow," we can make three pages: "Swallow," "Swallow (Chrono Trigger)," and "Swallow (Chrono Cross)." The first will be a disambiguation page that links to the other two, the second will cover the specific sword in CT, and the third will cover the weapon class in CC.
As for what to call the swords Crono uses, it's pretty clear that they actually are katanas (almost all of them, at the least). So, I think it would make sense to use "Katana" for Crono's swords and "Broadsword" for Frog's swords. The "Sword" page will cover the weapon class in Cross, and we'll leave a note at the top linking to the other two pages.