Pac-Man & Chomp Chomp is a variation of Pac-Man which likely includes a new character named Chomp Chomp. This could involve cooperative gameplay or possibly a new antagonist alongside the classic ghosts. Though the core concept is likely based on the original Pac-Man by Namco, the added character and any changes to gameplay would be original additions.  Further information is needed to determine which company or individual developed this version.

Pac-Man & Chomp Chomp

Pac-Man (Midway, with speedup hack)