Kind of looks like a tomatillo to me, though I haven't grown one for years... I don't see the first oval leaves that squash usually start off with, when planted from seed.

I agree that doesn't look like a squash to me at all.

I am talking about the leaves in the center, the rounded ones. Not the tomato on the top or the top left. Maybe I need a better picture.

It still doesn't look like a squash to me... Are those little leaves at the bottom part of it?

If I had to name a squash that kind of looked like it, I'd say it looks like zucchini sprouts that I grew out last year.

I'll have to get a better picture. It's been raining for the last few days and is about to start again.

Looks like zucchini or a variety of squash. try a google image search...

Here is a link that might be useful: