Yes, that's what they are-- parasite
eggs. I passed them some weeks ago. I also had black sheep fluke worms-- I think these sesame seed thingies were newly laid sheep fluke eggs.
I notice I pass alot of such stuff after being faithful in eating all raw fruits and veggies- and no meat or dairy or processed foods that day. My body then must turn more on the alkaline side- which kill alot of these parasites
when they are most vulnerable.-- and then I see them in the toilet.
There are also some who have had light brown sesame seed looking things also-- probably from another type of fluke worm.
All I can say is--"better out than in!"