we would have to know what you have. Most agamas will eat crickets, superworms, veggies, collared greens, kale, shredded carrot, try shredded apple, radish, try a small bowl of salad made with the veggies.
** Also I have to say this agama may have parasites/worms, maybe why hes so thin and sick ........
You really should call your Vet, he would do a fecal and check for them. But by the sounds of this lizard you better act fast.
I dont know what kind of agama you have, as far as its temperature requirements go. But I have black agamas and shield tail agama and temps are in the 90's
Is he eating by himself at all? Are you hydrating him? Plenty to drink?
If you have to force feed him you can use some chicken and veggie babyfood (gerbers) add a calcium suppliment. You can use an eyedropper, or empty syringe tube to feed with.
You can try giving him, pedialyte found in childrens isle in the grocery store, keeps his strength up (like gatoraide)
But try and answer some questions for us so we can better help
Sure hope he makes it. Let us know
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PHEve / Eve