Ersatzteile ("spare parts") or Ersatzspieler ("substitute player").
Like steak pies with delicious lung, pancreas, haggis and offal spare parts. We had a boutique chic trendy pie-shop where my sister asked for offal pie and was served strange looks.

That was the word I was looking for nickname nick ruok?'
We do, right now eat products that are not what they say, try seafood extender, nearly described in your post, it is animal gut
Seafood sticks, much the same, when first seen they had taste even some seafood in them, now not any willing to bet
My mentioned beef burgers could have been cardboard willing to bet something other than meat was most of it

THey had it 35 years ago , said George Orwell.
"On to each was dumped swiftly the regulation lunch — a metal pannikin of pinkish-grey stew, a hunk of bread, a cube of cheese, a mug of milkless Victory Coffee, and one saccharine tablet."