I didn't turn my compost pile this spring, and had an unexpected surprise that's been growing for the last few weeks. Can anyone identify what it is? I'm almost 100% sure it's some type of squash, but I don't know enough to tell what variety it is. From what I can remember, I've put waste from zucchini, acorn, spaghetti, and butternut squashes in the compost pile.
There's also another smaller plant which looks very similar, but the leaves are a different shape.
Full size pictures here.