They are 'false seed pods' and will be empty if you open one up...quite normal to have them, and they will look pretty much the same until harvest, although they can vary in size and may look more plump later on. There will probably be a pair of them at every node when you manicure your harvested plants for drying. I usually pop them off and add them to the pile of cuttings to use for making hash or cannabutter since they often have a bit of crystal showing. Nothing to worry about...