The actual dumplings using only raw grated potatoes sound like pyzy,
Yes, the one made with raw potatoes are called pyzy or kluski śląskie.
Related:Meatball and potato soup
I am looking for a polish soup with potatoes and meatballs. The meatballs had an unusual take, maybe majoram. My mother called it 'Fass' or 'Kfass'. Do not know the polish spelling. It had a sweet/sour taste.
Not sure. But Poles usually eat potatoes and meatballs as a second dish (not a soup). But let a female gives her opinion :) .
Meatballs are good. The more balls, the better they are.
That sounds like "żurek" which is also called "kwas" because it's made of a soured wheat base. You can make it with meatballs or kiełbasa.
And majoran is a basic seasoning for this.