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I can't tell but those photos look like little mesquite tree seedlings. Not disputing them to be anything other than apple. You could do research...
I am waiting on a sprout, myself. I soaked the apple seeds, let them sit for a few hours found a container with a top that shuts, put in the peat...
Plums have a pit, that should clue you in, and inside that pit there is a very delicate seed. However it might need that pit to grow, that pit...