RE: best 12 guage for young turkey hunter?
Camo guns are good for "Style points", but certainly not necessary. Whatever gun you choose should be a good fit in the length of pull, moderate recoil for the shooter, patterned to provide a dense pattern within normal shooting range, and one you have confidence in the performance.
Many manufactures make good turkey guns from very expensive to a reasonable price. If price is an issue, there are many "Pre-Loved" ..used...shotguns on the market.
If you choose a gun with removable chokes it opens up many addition opportunities to have a "Good shooter." Also just by patterning different loads can improve or decrease the chances of a good pattern.
The best method to select the right gun is by shooting them. If you have friends and relatives who will take you to the range to shoot their favorite shotgun, this is a good method. But don't pick it because it is what "Uncle Charlie" Shoots and he is a great hunter.....Be certain it is the right gun for you.....