volunteer squash plant
Yellow bumpy squash with crooked neck. I believe grew back but it is not bumpy and looks like a zucchini except it is school bus yellow and I did not grow zucchini last year so I was wondering if it is edible?
This is not unusual. A plant may have cross pollinated growing a completely different type then you had in the garden the year previous.
Your fruit is completely edible.
Here is a link that can help explain.