I'm considering acquiring a few turkey hens and was wondering can you eat Turkey eggs? Has anyone eaten one? How do they taste?
Yes, and here's a rare example of some on sale in a supermarket, in the "eggs" section.
These images are taken from the Buzzfeed article "19 Times Waitrose Went Way, Way Too Far", which gently makes fun of a UK supermarket chain that has a reputation for being rather posh. Individual Twitter users are credited in that article.
For a size comparison, you can just make out a box of hen's eggs on the left.
For an alternative size comparison, here's the same company's brand of osterich egg(s), duck eggs and quail eggs, on similar shelving in a branch of the same supermarket:
Yes - they are even commercially available now. In fact, almost all bird eggs are edible. Only a few birds have any kind of poison, and they live in Indonesia. This source gives more details about the two kinds of birds that are known to be toxic, and the nutritional benefits of eating eggs.
However, given the difficulty of obtaining eggs from large hens and finding the nests of smaller birds, they are not often described in survival or wildlife guides.