Nicknames: "The O Kid", "Yellow O"
Logo: We see the CGI "O" from the 1998 O Entertainment logo drop to the center, which shrinks, turns yellow (perhaps referencing the first O logo), grows arms and legs, and changes into 2D. The text "mation", in the Jokerman LET font, jumps out of the O's mouth, which then jumps up and freezes.
FX/SFX: A mix of CGI (smoother animation and frame rate than the original "O" logo) and 2D animation.
Music/Sounds: The "O!" from the O Entertainment logo at a slightly higher pitch, starting with a strange magical whirring sound, combined with whooshes/synth sounds from the classic Hanna-Barbera sound library. A high-pitched voice says "Mation!" and a snare drumbeat plays.
Music/Sounds Variant:
On split-screen Nickelodeon airings of Back at the Barnyard, the logo music was often followed by a short country tune, which played over the Nickelodeon logo at the time.
Also on split-screen airings of Back at the Barnyard, the original 2002 O Entertainment music