Not sure if it's something on the coin or a die chip, as you said, that has somehow rolled out of the copper core. Can you give us a clear pic of the obverse?
The first pics and these are the best I can get. I have tried multiple angles and different zoom levels up to x30. Unfortunately, I'm limited to phone camera and clip on magnifier.
Nice looking little anomaly. Image #4 looks like it is "bubbling up" from below. Any chance you've soaked it in acetone yet to see if it will come off?
FWIW- that is the "Charter Oak" on the quarter so that would be a honker of a copper acorn.
Words of encouragement are one of the major food groups. We need to consume them regularly to thrive and grow.
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