Food is chewed in the throat, not with the "jaw" necessarily, so I doubt pellets or "chewy" foods would be a problem. As long as he can gulp them in as small bites without straining he should be OK. Hope he straightens out for you!
I had a con born with a total jaw deformity, it was like a little crooked tube just big enough to suck in flakes. He grew just fine (albeit a little smaller & slower than his siblings) but lived about 7 years or so. He was so crippled I could keep him with goldfish. Couldn't hurt them if he tried!