Mogu Mogu Gombo is likely a Japanese Game Boy title with limited information readily available. The title itself suggests a playful, possibly whimsical theme.  Given the era and the platform, it was most likely a puzzle, action, or a simple arcade-style game. Further research would be needed to ascertain specific gameplay elements and the developer/publisher details.

Mogu Mogu Gombo (Japan)

Miniyonku GB Let's & Go!! (Japan)