Sam traded a T-shirt Carly made for her (to celebrate their five year anniversary of being friends) to "Rip-Off" Rodney in exchange for two tickets to a sold-out Cuddlefish concert, so she and Carly could attend it together in the episode "iDon't Want to Fight." In that episode, Freddie mentions Carly really likes Cuddlefish, it being her favorite band.
Cuddlefish was mentioned in iLike Jake as well. When Jake comes over to Carly's apartment, and they go upstairs to the webshow area, Carly plays a song through the speakers by accident. Jake then comments that the song is titled "Brake Lights" by Cuddlefish.