For the zucchini, as long as the outer portions aren't too watery, I would think you could scrape out the middles and stuff them - I've done that with overgrown zucchini before and it worked well. Here's a sample recipe but I'm sure there are lots online, including those with meat if you prefer that:
https://www.loveandlemons.com/stuffed-zucchini-boats/
You could also scrape out the middles and grate them to make all kinds of cakes and fritters. I love zucchini pancakes, especially with cheese and herbs! Here is another example recipe you may like:
https://www.foodnetwork.com/recipes/ina-garten/zucchini-pancakes-recipe-1948910
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