Are these anything

[reef12]

Thanks Me I do not know on these here.

Cheers

 

[flintdigger]

Was this found in a plowed field it could be plow marks ? If it was not found in a plowed field with the grooves it could be a abrading stone

 

[reef12]

Sorry found in a river.

Not on a farm.

 

[The Grim Reaper]

They look like natural stones to me.