Looks like pumpkin and tomatoes to me.

Free veggies!

Pumpkins/squash and tomatoes ALWAYS sprout in my compost pile...

could it possibly be spaghetti squash?

Hudgmuffin59 said:could it possibly be spaghetti squash?

it's possible, I suppose, but there is 100% no way to know for sure from a brand new seedling.

I totally agree with Rob -- there is NO way to tell at this point!

Unless, perhaps, that is the only kind of squash seeds that might have ended up in your compost pile... and there was nothing else growing that they might have crossed with.

Who knows?

Dig it under as green manure.

I toss everything in my compost heaps and always have all kinds of stuff popping up.

To OP - does it make a difference?

You could regard them as free plants, but you have no way to know what the quality, or with the pumpkin/squash type thing, even what general kind you have until they've grown for a couple months. Since we don't know your location, we don't know if you even have three months of growing season left to invest on these.
Bottom line- many seeds sprout in compost and I agree, there's just best dug back into compost.

im located in the 757 area of virginia virginia beach, chesapeake and most all of the produce i buy i from co-op local farmers, blue apron, and other local friends gardens. So i shouldnt have to worry about quality of the seeds right?

Probably not, but they could be the result of cross pollination of two different types of squash, or melon, for example, and not produce a very desirable fruit.

While cross pollination is a thing, it doesn't have to be a bad thing.
At my house... I grow out everything, even the seeds that come from the hybrid produce from the store.
Your main troubles are going to be the clod weather coming....

Even that might not be over problematic, when light frosts are predicted, I go out and toss bed sheets over everything that is still producing.... And... Like you, I have cantelope and watermelon seedlings just up... Ima set them out n hope fer the best.

I enjoy letting the "volunteer" plants grow ... which probably explains why my garden isn't too orderly .

It can be fun when you don't know what it will make. I've had my share of fun. Had some really unusual 'squashes'. But fun isn't necessarily efficient and productive, so choose what suits you = experimenting and chance, or more guaranteed results.

Looks like squash and tomato or marigolds to me. I would never just turn them over in the compost! I like crossbreds and even cross breed my own. Crossing broadens the genetic base. You mostly get good veggies from crossing but there are always the chance of a bad mix. I breed for health of plant 1st then flavor. And I like seeing things like this that nature obviously wanted to grow. Making it hardier than the others and added to seed stock.