This was a tough one. I wondered if it could possibly be a juvenile pine siskin due to a light yellow coloring on the chest. But it didn't feel like the right fit. So I asked one of my favorite birders and was directed towards a sparrow. Possibly a song or lincoln sparrow that has just fledged.
I would like to take this opportunity to talk about birds beaks. Bird beaks are essentially a compact layer of epidermal cells (horny sheath) molded around the bony core of each mandible,
the upper and lower jaws. In nearly all birds, unlike mammals, both upper and lower jaws can move
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