Don't know what your pictures are like but, if the second exposure is light enough, you might be able to make quasi-normal prints by dodging or some other way but it's a long shot. What's on the film is what's on the film and you can't undo it. The best thing you can do now is just roll with what you've got.
Remember, that "Fish Head" picture is one picture out of a whole 36-exp. roll. It's the only one that came out even half decent. Even then, I wouldn't call it great. It's only worth a chuckle.
I have done double exposures that are more interesting but those were carefully set up shots: