I noticed round holes in my lawn over the last few days. My neighbor thinks they are snake holes. He is just taking a wild guess per his own admission. I am in Maryland and we have had a lot of rain in the last few days.
Snakes use old tunnels of moles and shrews and gophers. There is no sign of digging for this hole so it just might be a snake. Snakes are usually totally beneficial and take care of mice, rats, voles that might do damage to your plants. The snakes are not going to be a problem.
Moles and gophers aren't a problem.
But your lawn could us some help. What time of year is it where you live? Where do you live?