One of my runner duck eggs hatched into this chick?

[Flat Rock farm]

Nice photos! If the chick hatched from a green egg, you probably have a little EE there. Its cheeks do look a little puffy.

I was just observing the same thing with the cheeks

 

[Tricoglossus]

Wow she's pretty, has she laid yet? If so, what colour are her eggs?

 

[StarLover21]

I bet she's an Olive Egger, and hatched from one of the darker eggs

 

[Albanydog]

Wow she's pretty, has she laid yet? If so, what colour are her eggs?

She is free range, don't know if she is laying yet or what color she is laying, would have to isolate her to figure that out! The runner ducks are laying now, just getting the hang of it actually, here is an odd colored egg from one yesterday!
Light on one end, very dark on the other! My Mom saw it in the egg carton and thought it was a small avocado! LOL