Right lobe/left lobe for the liver, I should have thought that when you said it. I tried to find any images like yours of a liver, but didn't.I guess I should say it was the other half of the liver. I don’t know if there is a term for the two half’s. But it was the liver.
It had a penis so it was a drake.
Abnormal livers I've seen have been pale, or petechial, or hardened, so never had one like yours. I agree with rebrascora again, don't eat the liver.
Just to pass on, since you have ducks, apparently hermaphroditism in ducks is possible.
http://www.backyardduck.com/female-ducks-mating-behavior/