Insect?

Caterpillar poo, have a close up inspection of your flowers for small green or brown grubs they can be small and hard to see especially the green ones, an indicator is the small black balls of poo have a real good look around those areas and inside the bud as well they tunnel holes into the stem of the buds. hope this helps. Peace & Happy Growing.

Its bat poop, don't worry, it usually doesn't make any harm and it will fall off with the wind or with a little shake at harvest. Usual thing to happen outdoors. Usually they fall on the soil under the plant and serve as fertilizer, but if they stay on the plant it may trigger the plant to produce more thc as a form of chemical wars, thc vs bat poop, who will destroy who... i had to take about a thousand of those in outdoor crops while trimming. So worry not m8, but it wont hurt to take them out as they appear. Gl growmie

Couldnt see anything from your pics. But if isn't dirt being blown on your plants and these things move then will want to get yourself an organic insecticidal soap spray. In evening spray bottoms of leafs.