“Can a chiropractor treat ankle pain?”

Absolutely if the ankle is sprained, then a chiropractor can manipulate the ankle stretch out the various ligaments and provide manipulative exercises that will help strengthen. If your ankle pain is simply a strain. It will get better with time cryotherapy electrical stem can also help. However, if you cannot put weight on your ankle, or if it is the formed, an x-ray would be important in arriving at the correct diagnosis and possibly further imaging studies such as an MRI.

Yes within reason. If the pain is from a fracture he cannot treat that.

Your best solution is to see a board certified podiatrist or foot and ankle orthopedist

Most chiropractors treat the back. I recommend you discuss your specific case with a foot and ankle surgeon (podiatrist) for a better understanding of your situation