The Lunar Orbiter pictures were processed in space and transmitted back home. I have studied many of these and there are all kinds of rubbish on them. It is difficult to see what is what really.
However, I have seen these shapes in a number of LO pictures and I suspect they are processing artifacts. I would not swear to it, but I think they are. There are things which look like sweaty fingerprints too, and I have come to the conclusion that these too are processing artifacts.