They are most definitely not from rodent, unless we have some pygmy species.
I should have given some idea on sizing, were talking mm, 3-4mm length perhaps 1.5 width.
Some of them looked like the back end of a ladybird larva !! i will open up the hive tomorrow to see what i can see, and perhaps find the culprit/s.
Chilled Brood would explain why they are not smooth but i have not seen any that small before, again that could just be because i dont normally have the correx sheet under the OMF at this time of year.