Mushroom fruiting bodies proliferate when conditions are suitable, and warm, moist weather favors many species. The mushrooms shown in the photos are probably a Coprinus sp. but we can't be sure by viewing photos. Mushroom identification should be left to experts. Some Coprinus mushrooms are poisonous and some are not.
If you need a specific ID or want to get more information, please direct your question to Ron Spinosa of the Minnesota Mycological Society.