A Czech koláč is always sweet, with no exceptions. I Googled the foods you and the previous comment mention, and I've never seen anything like them. The Czechs do sometimes bake bread rolls with a sausage inside, though – they are very big on sausages – and they're sold cold in supermarkets and bakeries as a savoury snack. I think they're called variants on "bread roll with sausage", though, and I don't think I've ever heard them called "klobasnek" or "klobasnik".
Saying that, now we live in the British Isles, my wife has developed a fondness for sausage rolls. Including Gregg's ones when we visit the UK. :-)