How old is he? I think it's normal in general. We had a doctor tell us that if they were making choking noises and getting attention then you were okay as they were working it out okay and you could react. If they really were choking you wouldn't here anything as the passage would be fully blocked.
I'd just keep a close eye on him as it could also be as said above, an allergy or reflux. I could also be tickles in the throat. Maybe ask at the next check up.
My sister's LO started faking it at one point as she found all attention would focus on her. However, I think she was older, just walking.