Some look like the shards left over from knapping but without knowing where they were found under what conditions there is no way to have any level of certainty. Some of them do look like possibly weathered spearheads but I haven't seen any made of that kind of soft looking stone... Most worked stone that I'm familiar with tends to have more jagged shear lines to make it easier to get an edge. Would really like to hear the story behind the finds regardless of what they are because you were definitely somewhere more interesting than me...