Beginner Gardening: Beginner...but this doesn't look like any zucchini I've seen, 1 by ryduj

ryduj wrote:
So, I bought some plants from a nearby farm and am growing a zucchini which is doing quite well after I got the advice to give them a little fertilizer back when they were doing poorly. I had a "zucchini" start to grow, and it looked ROUND. I thought that maybe it would elongate into the traditional zucchini shape...but it didn't! Plus, I have a yellow zucchini plant nearby which has femal blooms about to open, and those blooms have elongated yellowish baby fruits behind them. The round "zucchini" definitely had round baby fruit too....

Is this a zucchini? When is it mature? Thanks!