Can anyone let me know what these are on my lawn and if they harm the grass?

They are almost certainly field mushrooms, it is quite common to find them growing in lawns, pick them and use them with a morning fry up! Bacon, eggs, fried bread and mushrooms. Tastes magic!

and don't worry they won't harm the lawn.

In no way, shape or form will they harm your grass.

My suggestion would be to just pick them, eat them and enjoy them.

thank you guys I will pick them and have them as suggested with a fry up...much love AMT