Its hard to tell from the picture if its just the crop with something in it, or if its a crop with a growth on top of it. I'd take his food dish away tonight at around 8pm and check him in the morning when he's had plenty of time to digest and empty his crop. If its flat, with no lumps, he's probably fine.
Also, the little spot with the arrow pointing in the one picture just looks like an empty follicle with some blood. He may be lightly plucking that area. Which may or may not have anything to do with an issue that may or may not exist. If he were mine, I'd towel him now and try to determine if its a growth on or beside his crop, or just a chunk of nut or something in there. Crops with chunks of nuts or carrots etc can be a little concerning at first. My macaw that eats mostly nuts has a drastically different feeling crop than my cockatoo that shaves everything into tiny slivers before swallowing them. I've rarely felt my amazon crops due to the fact that I like my fingers attached to my body and they rarely give me reason to towel them. However, when I do have to towel one, I feel them up all over to make sure they don't have any lumps and bumps hiding that might need a vet check. I think its a good general practice to do at least once a year for those of us that don't do annual vet checks.
