Depends.
If you mean the game that jailbreakers had before the appstore, than possibly yes.
If you mean the games you buy on the appstore, than most probably no.
If you meant the former, than it would depend on the game. Many of the games would use specific features of the iPhone, like UIkit, the accelerometers, or the multitouch capabilities. Any of those things wouldn't work, simply because no suitable alternative exists on the Pandora.
Some games, especailly those ported to the iPhone from other platforms, may have more portable code, and a port would be much more likely.
A good example would be gPSP, the gameboy advance emulator. It is designed to run on many platforms, which makes it a likely candidate for a pandora port.