What is the role and importance of the chorus in the play "Frogs"?

Chorus of Frogs

Sings for Dionysus while he takes Charon's boat across the Styx, jesting and teasing with their rambunctious croaking and singing.

Chorus of Initiates

Part of the Eleusinian Mysteries, the Initiates help Dionysus and Xanthias on their path and also sing of the rites and members of the Mysteries, the glories of Demeter and Iacchus; they also poke fun at notable politicians and poets.