What was the name of the group of girls that appeared on the US TV show "The Banana Splits Adventure Hour"?

The Banana Splits Adventure Hour is an hour-long, packaged television variety program featuring The Banana Splits, a fictional rock band composed of four funny animal characters. The costumed hosts of the show were Fleegle (guitar, vocals), Bingo (drums, vocals), Drooper (bass, vocals) and Snorky (keyboards, effects).

The series was produced by Hanna-Barbera, and ran for 31 episodes on NBC Saturday mornings, from September 7, 1968, to September 5, 1970. The costumes and sets were designed by Sid and Marty Krofft and the series' sponsor was Kellogg's Cereals. The show featured both live action and animated segments and was Hanna-Barbera’s first foray into mixing live action with animation.

The Sour Grapes Bunch is a group of human girl characters from the Banana Splits. One of the members of the club - Charley, usually played by Shirley Hillstrom - would bring a written note to the Splits. None of the Sour Grapes spoke in the entire series; however, they would also do a number with the Banana Splits. In the first-season episode on October 5, 1968, a song debuted entitled "Doin' The Banana Split," as all five girls appeared together with the Splits.