Can you supercharge a '92 4-cylinder Mitsubishi Triton engin?

Theoretically you can supercharge any internal combustion motor. Practically, there probably is not much in the way of off-the-shelf parts available to supercharge a 2.4 litre Mitsubishi motor. In addition, the relatively small size of the motor (compared to many supercharged motors) means it would be difficult to achieve large power or torque gains.

If you really want to go down this path I would advise a turbo instead of a supercharger.