As far as I can see from the photo they could certainly be blueberries (regular or rabbiteye). They at least look like some sort of Vaccinium, of which I can't think of any truly poisonous ones but please do not quote me on this I'd say wait til they ripen, see if they taste like blueberries, and don't eat too many at once
They look like blue berries to me. When I find a new looking berry, I usually smell it, taste it, and determine if it was worth eating. Most poisonous things will taste bad to us.... but if you get sick, don't blame me!