Silgrad Tower from the Ashes

Do they have a ST prefix or what?

If you mean in the CS, then all new objects and models have the ST prefix along with the modding Initials of the person who put it in.

I was wondering if the object has a morrowind counterpart if it had the same name as that. I was gonna give TESPort a try with statics to see how it looks.

There's not much order to the way the nifs are named and organized in ST, essentially because it doesn't matter all that much since modders use the Construction Set's ID tags to find the objects they want to mod with. When the main ST folder got too crowded I made a new subfolder and changed the links. However, when possible models do retain part of the title they had in TES3, so that we know which ones have been remodelled and which remain to be done.

Shucks, I really wanted to try TESPort with statics.