If they ever did a live action Rise Of the Guardians. Would Mitch Hewer be the perfect Jack Frost?

Possibly, but he looks too old for me. Jack is a teenager, whereas Mitch Hewer looks his age, which is too old to be Jack, in my opinion

I think Max Theirot from CATCH THAT KID or PACIFIER fame would be a good match considering his glower matches the look Jack gave Bunny when he shot him with a blast of ice in the race to collect the teeth.

Huh, he does kind of look like him! If I had to choose, (though I'm a little biased because I'm a fan of him, lol) I think Declan Galbraith resembles Jack a little! I actually took a picture of Declan and changed it up a bit to make him look like Jack (It's on my deviantart account now). I'll show the pic. You should also look Declan up himself. He's not an actor, but he looks the part and he's only 21. :)