i havent a clue what it is but did it come out all by himself or was he found inside the bowel movement?
i think that it could be some sort of fluke. those things look like the two suckers they have??
i wish i could be more helpful, but i am in the same boat.
i sent the one i had in and they said it was mucoid plaque.
you can see my pics under parasites/healmyinsides