Did Naoya had his Domain when he was a human? Anyways, since energies are equalized, Cursed Naoya's Domain's sure hit would work on Pouf, but unlike the sorcerers, in the case for Pouf, freezing his cells is only going to freeze him, not make his body go haywaire(as Chimera Ants have a different biology from humans and Pouf consistently splits his cells from his main body while not being affected from that). And Naoya can't affect Pouf with physical attacks. So I think Pouf can outlast Naoya until the latter gets CT burnout or runs out of CE. But, this is a fight that Pouf can win, not will win. Thing is, Pouf doesn't win fights, nor does he want to(in character).