What you say, Lawn Squash?
It is the only way I can describe it. When it first popped up it clearly had the leaves of a baby squash plant but I am hardly a plant person. We have guarded it gently while we mow around it just to see what will happen.
So if you have some advice on what the heck it is or HOW it came to my lawn let me know.
I am happt to say it is a beautiful addition to my sad yard.