Um, no, that would pretty much be a wives' tale. You can feed scrambled eggs, boiled eggs, fried eggs, any other kind of eggs you want to your chickens with no issue. It's a good way to use up extras that you have no other use for. The chickens won't make the connection between cooked eggs offered to them and what is shooting out the back end of the hens.
I probably wouldn't give them whole shells,no point in giving them ideas.
Deb
Mine made a very strong connection between the two. I had to get rid of 4 hens because as soon as they laid they would peck at and break open the eggs. Theres threads on it on this site as well. Im not the only one.