My kids have learned the precise term for the savory ones from me, but you're right that most Texans, even many Czech Texans, do not know it! To be fair, the origin is that Czech Texans used the same kolache bread and stuck meat in it. People might not think it matters, but many kolaches I've had from shops do not use the bread I'm familiar with from my grandmother (and cousins). I won't name names, but their bread doesn't taste very good, and only a few shops make the same bread I grew fond of at my grandmother's house, and that same kind of bread was used for both the sausage ones and the sweet ones at my grandmother's house.