Yes, I learned only last year that types of squash grown in proximity to each other will hybridize ... I had seeds of pure Gem Squash, those lovely small round ones, and planted it near other squash. Saved the seeds, sowed them last year, and OOPS they were strange big spaghetti squash type. Sooo disappointed. Now I have pure seeds again that were gifted to me ... but nowhere to plant them am in an apartment

Beautiful start!

Oh, the anticipation what will come from them!

It will be interesting to see if you get something edible from them. It's fun having mystery seeds. I picked up a seed head from the ground at a big display garden and grew them and they turned out to be a very pretty canna brasiliensis.

Courgettes?

Pumpkins can hybridize with summer squash and gourds, probably not a pure pumpkin since as you've observed the different foliage. I had one that tasted pretty good. I have lots of volunteers in my yard and encourage them, plants spring up where they grow the best, don't argue with mother nature.

That looks good. you might have too many plants for one pot. i grew my in the garden with a small hill of dirt and sometimes two plants on the same hill doesn't do very well. but I've never try it in a pot. So I could very well be wrong.

Looks like squash to me. Sometimes I see growth from a seed I planted two-three years past. My compost is growing a squash too. Speaking of gardening, I need to leave Agnostic's now and get to work.