Air Potato

I have no idea where this comes from. My wife thinks that our local nursery handed her some seeds once, she planted them and forgot about them.

Then suddenly this thing starts growing on oneof our trees and she couldn't figure out what it was. It kept growing and now as you can see it is quite large.

The reason they call it an air potato is because it has things like you see below all over it.
And I do mean all over it.
It is I fear not edible, at least by humans.
I am hoping that the deer eat it and get sick but I doubt I will be that lucky.