Need help identifying a tree

ssandra7984 starts with ...
Hello everyone, I need help with identifying what this tree is.

Last winter I used the veggie and fruit kitchen scraps for compost, and I basically dig holes on the ground and threw the scraps in.
Long story short, I have tomato, chilli, apple seedlings growing at random spot around the garden.

Now, this tree is unknown to me, I tried to find it on google, on weed list, etc, but can't find it.

Anyone knows what this is?

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