I have heard of many beardies swallowing odd items and being able to pass them with no problem. Let's see if we can help your little guy out.
First of all... don't feed your beardie anymore solids/feeders until he is able to poop.
Try getting some babyfood applesauce or some canned pumpkin(no sugar), mix it with a drop or two of mineral oil or olive oil. Feed it to your beardie with a needleless syringe.
Besides that you also need to give him baths. While he is in the
bath gently massage his tummy(on the right side) with your fingertips, starting at his armpit moving downward toward his vent. If you come across any hard lumps while doing this, concentrate on those areas, massaging gently in a circular motion.
Try this and see if it helps. If you do not get him to poop or pass the concrete, you will need to get him into the vet asap.
Let us know how he is doing.