Anyone know what these are ???

So I recently adopted a kitten who is about 4-5 months old & where ever he lays for a while or sleeps he leaves these behind.. anyone know what these are ??? We’ve given him deworming medicine twice already (as directed) & he’s not UTD on shots or fixed (if that helps or makes a difference) we do plan on doing all those things but since COVID vets in my area are scheduling months from now..