Mushrooms ID help

Hi,  we just had a load of manure delivered a week ago,  I noticed today it is covered with mushrooms or toadstools.  I snapped a few pics and hope someone can help ID these and let me know if they are a hazard.  Many thanks in advance.

Sorry it's not one I recognise.

I'm not sure what you mean by hazard but unless you can positively identify it yourself as edible then treat it as inedible.

Thank you,  I don't plan on eating them   I am just concerned as we have quite a lot of children about the place when its fair weather.