Let me ask a question, if I may. What are the specific characteristics of each individual rock that leads you to believe that they are man made artifacts? Please use precise terms as well as you can.
There is no evidence of these stones being physically tied to anything. I would suggest, should you have a desire to learn, obtaining a few books on stone tools. Someone might even chime in with a title suggestion or two. Even after some study, it will take some time to recognize what is man made vs what is completely natural.