I noticed dead crickets in my Bearded dragons poop is that a parasite? He seems rather odd as well too. Instead of being everywhere, he just lays on his basking log all day. He gets down to eat and drink though.
How old is he + how long have you had him ? Do you know the temps. in the tank ? It may be that the basking spot is not hot enough r maybe he ate too late for proper digestion.