A week or so ago, our neighbor brought us two small flats of (we assumed) veggies he had left over after planting his garden. They grew a bit, and a few days ago I replanted them in much larger pots. He wasn't sure what they were, so I turned to my trusty phone app (Plantsnap) for an ID. Seems these are cherry tomatoes. No idea whether they'll multiply and be fruitful, but they sure are growing fast!