Certified GKH Gardening Expert
Yes, these are poisonous to both humans and most animals, like cats and dogs. If you have small children or pets, you may want to take steps to eliminate these from your lawn. Here is an article you may find helpful: https://www.gardeningknowhow.com/lawn-care/lgen/eliminate-mushrooms-in-your-lawn.htm
I think it is safe to say yes.