[Crowbob]

Yes. No. Did you put compost, mulch, topsoil, wood chips or fill before seeding? If so, the 'shrooms will probably diminish over time. The spores were probably in the compost, etc. Once you find out what species they are you can change the pH not to their liking and they will go away. Most likely you will water the grass less as it fills in which may also help. Take a bite out of one and let us know how long it takes to see the beautiful colors!