They look humanoid with digestive tracks and possibly lungs. What if they are from not space but a hidden race inside earth? I have no idea where they got these from.

Some look real, a few fake. But even the surgeries showing their insides could be faked.
i don't believe in space aliens but other life forms? yes. i've seen weird bigfoot things. several times
maybe these are humans they made live underground and they got all messed up from living without sunlight