Errrr...isn't that what they're called?Or is there some other terminology for abnormally small eggs?
This egg appears to be normal...just super duper tiny. It's hard-shelled with little extra flakes of calcium on it. My mom thinks it's too cute and doesn't want to crack it open, but I want to know what it looks like inside!
Now that I think about it, I have had one with a hard shell as well. As I recall, they both just had a tiny chunk of flesh surrounded by egg white. No yolk.
Other than fart egg, they are also called wind eggs. I think there is another name as well but I forget what it is.