It is possible that a village in some part of Prussia could be said to be "near" the Black Forest but you will only get help if you can be more precise, Could I suggest again that you take a look at a map of Prussia both to see how vast it was and any points where it nay have bordered on to Wuerttemberg. You then need to narrow down the search to a particular town/area. You will get nowhere just saying "any villages in Prussia near to the Black Forest."