I have not thought a lot about how old Toberg is. But I have always thought of Toberg as a Nordic (Garheim) name.
Lets see how we can make this work. I will give it a try:
Maybe the Knights of Calmonn (or some of them) hid in a cave close to Calmonn. Here they made the new headquarter of the Knights of Calmonn. While some men went back to Calmorn, to build the city of Fangroth, some men stayed in the cave and founded Toberg school of Warfare. For some unknown reason they named the school after the general of the Crown Knights: Toberg (the name should always remind them of this day). This would make the Toberg guard descendants of the Knights of Calmonn.
Also Toberg would have a secret cave deep under the school. I would love to build that.
