It is a squash. Looks like a nice little pumpkin.

Kinda looks like a pumpkin. Also looks like a nasty powdery mildew problem.

Agreed on both points.

Nicely shaped little pumpkin too. Give it plenty of compost -- they're heavy feeders -- and it might get some size on it. :-)

It is a zuchinni. I just bought several for $1.00 a piece at the Farmers market.

If its bigger than a tennis ball its probably not a round zucchini.

Almost all zucchini sold in the US are bush type plants rather than vining ones. :-)

You never know what sort of wonders might grow out of a compost pile.

My volunteers this year appear to be watermelon.

its a specialty squash , I have some growing on a trellis and some crawling on the ground(like a long island cheese) they grow big 8-15 lbs.