I would probably say he is still adjusting to his new surroundings.
If he does another poop then you will know if he has eaten something. They can eat/drink when you aren't looking sometimes. Sneaky guys at times.
I'd say give him another couple of days. A Cham his age can go a week without...
That cage sounds a bit small for an adult veiled. He may be stressed with this.
What size cage was he in before? Is it a new cage?
Chams can take a good few days to adjust and settle when moved to new surroundings.
Ive had this before on my panthers leg. It didn't shed properly and seemed to fuse back to him. It came off no problem the next time he did shed though
Probably too hot. They gape to cool their body down.
Check your temps are right first. If they are right already then it could be something else such as RI
I find a bunch of them are joined together by silk and chow. Can I pick them up in a bunch and put them on top of fresh food? Also, there are white bits in amongst them- is this their skin thats molted?