Selfsufficientish.com

I bought this at my sons school fayre last week. They said they thought it was a pumpkin but it doesn't look like my pumpkins. I thought maybe squash ?

that looks like a dwarf sunflower to me.

but correct me if im wrong

I think Crowsashes is possibly right.
I can certainly tell you one thing though, it's not a pumpkin or a squash .... no wait that's two things.
I can certainly tell you two things, it's not a pumpkin or a squash or a marrow.

Nobody expects the Spanish inquisition

Yep, that looks identical to the sunflowers in my garden which, according to my label, are Helianthus annus 'Pastiche'.

agree with above!

I've got something that looks like sunflowers in my garden too but they aren't forming flowers... not sure whether they are sunflowers or jerusalem artichokes. Pic will follow.

I didn't even know you could get dwarf sunflowers 
thank you !