could it be Cucurbita foetidissima [buffalo gourd]? though I am not sure and he more I look the less likely it is.

any flower buds yet? and is this the first year you have seen it?

It’s been there a couple years. But taking over the tree. I liked the heart shaped leaves on it. That’s why I left it. But now it’s got to go. It does not flower. It just a vine with leaves.