Frogs are amphibians featured in many Muppet productions.
Muppet frogs
Sesame street frog

Frogs is a Background Muppet non-speaking of The Muppet Show: Sex and Violence, Episode 108: Paul Williams, Episode 114: Sandy Duncan, Episode 310: Marisa Berenson during the wedding sketch, Episode 317: Spike Milligan, The Muppet Christmas Carol, Caribbean Amphibian with Kermit the Frog and Jimmy Buffet in Elmopalooza, Kermit's Swamp YearsIt's a Very Merry Muppet Christmas Movie, Muppet*Vision 3D: Adventure of Showtime (Preshow only), Muppets Most Wanted during the wedding scene, Episode 704: John O'Hurley, Episode 705: Martin Landau, Muppets Go Global during the wedding scene, The Muppets: Come Dine With Me, The Muppets pilot (15sturmelle's version)Muppets Visit Italy, France, and Scotland, The muppets celebration of 60 yearsEpisode 412: Tim Mcgraw, Link Hogthrob in Love, True Family Reunion, Gonzo's Nature Show and Fozzie and Doris for Life.

Their latest appearances included Billy Bunny's Animal Songs (1993) and Kermit's Swamp Years (2002). In the latter, they appear as Kermit's brothers and sisters, and a separate clan of Frogs are seen later in the pet store. One blue frog can be spotted in The Muppets.