IMHO, just about anything would be better for a youngster than a Nagant, with its heavy trigger pull and awkward grip, plus lack of proper ammunition.
Ordinarily I would recommend a .22. If he has already fired a .38 he might not want to "go back" to the .22, but the lower cost of ammo and the light recoil really do make it a great learning gun. It would take a lot of luck to find one at a reasonable price, but an S&W Kit Gun (Model 34) or Ruger Bearcat would probably be close to ideal.
Jim
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