Wolfpack (sometimes referred as Wolf Pac) is originally played in Wolfenstein 3D (DOS). The secret level throws you into a 3D Pacman level, so the music is appropriately cartoony.
The music has nothing with the music of original Pac-Man (ARC) or any of its ports.
The name is verified by in-game jukebox.
Wolfenstein 3D (DOS)
It plays as the music for the secret level of episode Die, Fuhrer, Die! (E3M10)
Wolf Pac is track 27 in the game's data. Its title in the IMF meta data is "PACMAN". This song is not in the shareware released of Wolfenstein 3D. The title "Wolfpack" is a play-on-words of "wolf pack" and "pacman".
Wolfenstein 3D (WEB)
It also plays on E3M10. This version is almost identical to the original.