Koji the Frog (Classic Mac, Marco Carra/Slimyfrog Software, 1995)

You can download Koji_the_Frog.SIT here.

To run it on modern systems, change the end of the filename to .sit (lowercase), drag it onto the emulated desktop here, then open The Outside World, then Downloads, then Koji the Frog and run the game.

To unlock the full version, use the name nowhereman and the code NCBPOXKFL.

You can read an article from @obscuritory about it here.