What is this Austrian dish? It resembles potato croquettes?
The term you are looking for is "Rösti-Taschen". Alternatives could be for example "Rösti Tascherl" (Austrian diminuitive) or "(gefüllte) Kartoffeltaschen" (denoting the ingredient). 

They are sold as convenience food by various suppliers (1, 2), recipes to make them from scratch seem rather scarce (and typically in German). 

The base principle is making a dough from starchy potatoes, egg, flour butter etc., wrap it round the desired filling and deep (or shallow) -fry them in fat. Breading them is optional, but can help them keep their shape. I suggest starting with a recipe for croquettes and a recipe for the desired type of filling, then combine them. Tweak as necessary.