This series is a parody of Rugrats, a famous 1990s Nicktoon. It is a show that centers around baby characters, that cannot walk, talk, or take care of themselves in anyway; the only "speaking" character is Timmy Turner, whose thoughts are heard.
Carpet Critters was the second television program Timmy visited in "Channel Chasers", after wishing for a Magic TV Remote that allows him to travel through television as if the programs were real worlds. Timmy seems quite bored with being in the program, as the other babies look at him creepily, and he ends up pooping his diaper.
This was animated by the company who created "Rugrats": Klasky-Csupo (Pronounced: Class-Key Chu-po)
When Timmy poofs into this show, there's a baby that resembles Phil.