Name that plant

Plants pop up around Deerfield all the time, and despite my investigative efforts, I have no idea what they are.

The odd ball in the photo below came up in the middle of my blueberry patch. Its leaves span about 30 inches. The texture of the leaf is almost like a lamb's ear, but it's about five times as big as any lamb's ear I've ever seen.

The plant/vine at top right came up beside my ersatz well. It has grown to the current length of about five feet in less than a month. It looks like a squash of some kind, but by this time it should have some fruit buds starting to form. I don't see any.

If you have any idea what these might be, please let me know.