Hello, welcome to the community...I'm so glad that you found us, because your Green Cheek's feet are very seriously infected, and have been for some time based on how advanced the infection looks to be...His feet are both extremely swollen and inflamed, and obviously have many little areas where the skin has been opened-up and their is pus in them...And even though they are scabbing, I have to tell you that I am extremely worried about your bird's well-being. Both of his feet are extremely swollen and red, and it appears that the swelling is advancing towards his legs.
If this goes untreated, your bird could become very, very sick and eventually die from this infection...I'm not trying to scare you, but I do want to impress upon you how serious this infection that he has is. Ideally he would be taken immediately to an experienced Avian Vet for a culture to figure out what is causing the infection, and then he would be given the proper prescription medications to treat the infection, as well as some anti-inflammatory medication and pain medication, as he is no-doubt in quite a bit of pain, even if he's not acting like he's in pain...Birds purposely hide all outward signs of illness and pain for as long as they can, it's a survival instinct to protect them and their flock-mates from predators, who target weak birds...But he is no doubt in severe pain based on how swollen and inflamed both his feet are...
We can try to help you, but we need a lot more information about how this happened, your bird's environment, and where in the world you are/live...
1.) How old is your bird?
2.) When did you first notice that something was wrong with his feet? (How long ago did this first start?)
3.) Is your bird housed with or share his cage with any other birds, or do you have any other birds that he is around?
4.) Is his cage environment clean and dry? Or is it common for him to be walking in or standing in a lot of poop? How about water or dampness, does he commonly get into wet/damp areas? Is he housed outside or inside? And Where is it that you live in the world, what country?
5.) Has he been picking at his feet? Do you have any idea how this first started? It's obvious that it has spread and gotten worse, but it's important to know how it first started...
It's very important that we try to figure out how this first started, because without being able to do any lab-testing, like cultures/swabs, we can't know what type of infection this is...Is is Bacterial, is it Fungal, is it a Parasite, etc. And without knowing what type of infection it is, we can't tell you what medication will treat it...For example, if it's a Fungal Infection (often happens due to constantly damp/wet feet or environment), and we were to tell you to give your bird an Antibiotic, which only treats Bacterial Infections, the Antibiotic would actually make the fungal infection worse and worse...So we need to know as much about what has happened and your bird's environment, diet, any other birds that get close to your bird, where you live in the world and what type of parasites might be located there, etc. to try to help your bird...
I'm very concerned about this infection spreading into your bird's bloodstream, and making him very, very sick...Is he eating normally as of now? Is he acting normally, playing normally, etc., or is he at all lethargic and sleeping more than usual? Any vomiting or loose, watery droppings?
***Could you possibly take a photo of the bottom of your bird's feet for us to see? It's possible that this started-out as a condition called "Bumblefoot", and the infection simply spread to the rest of his feet and legs...Also, do his legs also have scabs on them, or are they also swollen or red? Or is it just his feet?