Hang on... You might be unlocking a childhood memory here. Is Keroppi the name of the frog or what it is from?

Wait, I got it! Memory unlocked! I recognize it from an arcade game from my childhood! All I could remember was this frog and ONE BIG BUTTON.

His name is Keroppi or Kerokerokeroppi! “Kero” I think is the Japanese word for the sound a frog makes.