I’m born in Silesia which now is part of Poland but before WWII was German.
Anyway, we make some specific potato dumplings there. I moved from there in 1989, and I probably had them since there somewhere. But today was the first time I made them myself.
Here is a simple recipe if you’re interested: https://polishfeast.com/polish-silesian-dumplings/
Bob’s Red Mill, Streit’s and Manischewitz all make it, so look in the Kosher or Baking sections. I’m pretty sure it’s used instead of cornstarch during Passover.