I'm a scoutmaster in the Czech Republic and we would like to visit Austria for couple hours with my scout troop (aged 12-16, we're all Czech citizens). Are there any special rules about such situations when I (not the parent) travel with children to another Schengen country for such a short time? What documents do I need from each of the children?
According to the official EU website:
In addition to their own valid passport or ID card, all children travelling:
alone; or with adults who are not their legal guardian; or with only one parent may need an extra (official) document signed by their parents, second parent or legal guardian(s) authorising them to travel.
You should first consult the local embassy of the country the children are travelling to for information on which, if any, other documents they need to make the trip.
Which means that the children would need their own ID Card (Obcansky prukaz) as well as an official authorization from their parents.