Alright so we took him to the vet today with a sample of his poop in a little bag. They did a general exam on him and said he had no signs of anything wrong with him. They checked his poop and did a poop examination under the microscope and the vet said it looked like SEEDS to her. She then did a "poop float test" to make sure no parasites were present, and NONE showed up.
That being said, she doesn't know for sure what it is, but that her best guess is a seed. We have no clue where the seeds came from or when he might have eaten them, especially considering this happened days ago and he is STILL pooping them out? We have not let him outside since finding them.
So basically, after a $100 vet bill, we know at the very least what they AREN'T. They are NOT tapeworms, flea eggs, or parasitic.
I was told I shouldn't be concerned because he's healthy, and that she would be going home and doing some googling and research herself to try and figure out what it might be, since it is a mystery to her!
I'm just glad he isn't sick or in any pain! Phew!
Thank you all again for your helpful suggestions. It made me feel much more calm and informed about the whole situation until I was able to get him into a vet! Much love to the community!