Nothing like blueberries...looks like wild grape to me.

They look like wild grapes. We used to make the best jam from them when I lived in Kansas many years ago.There was a small river and they grew along a fence line.

I am no expert, so you should not eat them until someone tells you for sure. If they are wild grapes, lucky you!
Maybe a neighbor would know, and others on gardenweb have more experience with wild berries than me.