Haunted house

So I posted a few days ago about my weird haunted house stuff, my 5 yr old nephew was here and asked "why do you have that green man here?" I said what green man and he pointed in the corner...... What the hell could a green man be?? Is there some weird spiritual thing like that or what do you think it could mean that he says he sees a green man?? FYI, he doesn't ever hear about any of my weird stories so he has no knowledge that I even think my house is haunted, and it's not something he would make up. I'm just puzzled on what a green man could mean or who it might be.