Songs with Robin the Frog as a solo performer, in duets, or prominently featured in cast numbers.

The Frog Prince

• Sir Robin the Brave
• I'm Nineteen (with Princess Melora)
• Sleep, Sweetums

The Muppet Show

• Halfway Down the Stairs, from episode 110
• I'm Five, from episode 212
• Over the Rainbow, from episode 307
• Someone to Watch Over Me, from episode 310
• Leave Me Some Magic, from episode 421

Accompanied

• I'm in Love with a Big Blue Frog (with Mary Louise, Kermit and other frogs), from Episode 108
• Sea Chantey (with Fozzie Bear, Gonzo, Scooter, and Link Hogthrob), from episode 220
• Two Lost Souls (with Sweetums), from episode 223
• Octopus' Garden (with Kermit and Miss Piggy), from Episode 312
• Frog Kissin' (with frogs), from episode 406
• Be a Frog (with frogs), from episode 406
• If We Ruled the World (with Hal Linden), from episode 517
• Surfin' USA (with Kermit and other frogs), from episode 518
• Friendship (with Kermit the Frog), from episode 519

Other

• When the River Meets the Sea (with John Denver), from John Denver and the Muppets: A Christmas Together, and Late Night with Jimmy Fallon with Kermit the Frog
• Just One Person (with several dozen other Muppets), from The Muppets Celebrate Jim Henson
• Can't Get Along Without You (with Kermit), from Kermit Unpigged
• Christmas Scat (as Tiny Tim, with Kermit), from The Muppet Christmas Carol
• Bless Us All (as Tiny Tim, with The Cratchit Family), from The Muppet Christmas Carol
• Fun, Fun, Fun (with the Frog Scouts), from Muppet Beach Party
• I Will Survive (with Muppet Monsters), from Muppet Monster Adventure

Honorable Mentions

• Although he doesn't actually sing in the number, the performance of "Just One Person" in episode 212 of The Muppet Show was very much for Robin.
• Catch Another Butterfly and No One Like You from Rocky Mountain Holiday is sung by John Denver to Robin.