The WB was a television network created by Warner Bros., which first broadcast in January 1995 and ceased in September 2006, when it merged with UPN to create the CW.
In episode 205 of Muppets Tonight, Kermit the Frog (in his guise of Virgil the Monkey) inquires about a job at "The dubba-dubba-WB" at an unemployment agency (the term was the catchphrase of the WB for a short time). He is informed that they already have a talking frog.
The 1998 Henson series B.R.A.T.S. of the Lost Nebula ran briefly on Saturday mornings as part of the network's Kids WB block.