Can you take some closer photos showing the stem and the underside of the cap? It will be easier if you pick a few good condition examples and photograph them against a neutral background like a piece of card.
Good guess, Conocybe apala also known as milky conecap. If that is correct them you should find that each mushroom only lasts 24 hours. It is very common in short grass and is nothing to worry about. If you don't like the sight of them on your lawn then just brush or mow them away.
Tall trees
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