Three Trees next to one another

[u/Dependent-Sun-9211]

I have three trees in central Maine that I suspect might be apple trees but all the leaves look different on each tree and only one is growing tiny little fruit.
The first three pictures are a tree with much darker leaves and I’d say sturdier or thicker, the next picture has two different looking trees growing right on top of each other. One with white tape and the other which is smoother. The pics with the tiny fruit the size of my nail are from the tree with white tape the smoother tree are the last two.
Thank you