This is the Warner Brothers shield logo on a purple television screen, with an animated green frog-like character in a straw hat and red bow tie…
The Simpsons, “Lisa's Sax” (season 9, episode 3), 2:17–2:27
What happens
This is the Warner Brothers (WB) shield logo on a purple television screen, with an animated green frog-like character in a straw hat and red bow tie, the Krusty-style cartoon mascot not matching any regular, so no named Simpsons regular appears. The character bounces and dances beside and in front of the shield, at times leaning on it, holding a microphone and a pie in one hand, then twirling and tipping his hat before sliding off to the left edge of the screen. The shield stays fixed in the center throughout, and no on-screen text is visible besides the WB letters.
Written by an AI model from frames of this moment, so small details can be off.