I'm trying to find out what tree this could possibly be. I don't think that it's a Brown Turkey of any kind. The fruit seems too light to be BT, even if it's not ripe yet. I could be wrong however. Also the leaves are off. The tree is in Houston, TX if that help narrow it down. These are all the pictures I was sent. No inside view of fruit. Even without the inside view I'm sure we could narrow it down based on, leaf shape, location, fruit color, etc.
Celeste, and Brown Turkey is what I believe it not to be base just on the leaves.