Those look fine. Only don't eat any 'green potatoes'. Those aren't green. It's just a darker variety, maybe red which are yummy! I'd be curious to try it.

Did the dark ones all come off the same plant? If so it might have been a different variety that got with the seed potatoes by mistake? They do have a greenish look under the skin though - try peeling one and if it is green discard it.

I'd certainly scrape the skin back and see if the tuber is green. if they are don't eat. I suspect they might have been at the surface or from a different variety as Stera suggests.

Thanks for your comments.
They came out of the same container but I think each one is from a separate tuber. I tend to put three in a container. One has gone rather soft so I will throw that one away.