I'm not so sure about the first one, there are no sharp edges, and it would not have weathered away to dull as they are made of hard rock.
The one in center of pic 3 and 4, the same one as in the last pic. is def. a point. as you can clearly see the Conchoidal fracture.
That said the first one may well be a native artifact, just made of "practice stone." as it is not looking like any I've seen with it's "dull" appearance.