It does look like food, like pinneapple maybe? At the same time, I have had end pieces of large roundworms look exactly like this. Their bodies seem to shred and fan out into sections depending on the decomposition stage they are when eliminated, and they can get tangled.
I have had things just like your 3rd and 4th pic that I maneuvered with a plastic fork and it untangled to be long worm.