Unable to identify What are these rocks

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Can anyone identify what these rocks are? It's been a question that I have had for the past 5 years. I started digging these little rocks up when I began tilling a new garden bed about five years ago. I still find them all the time. They are all in an area of 3 or 4 feet. I've asked many people and no one has a clue. One fellow thought they were fossilized snake eggs. They are gray, and about 1 inch long. I have many more that are not pictured.

Unable to identify What are these rocks | Ecency