Rosebud is the red-haired female Klown.
She was seen sitting next to a ball pool where Rich and Paul Terenzi had landed in with Daisy. They had kissed Rich and Paul on their faces and were trying to cling onto them, but Rich and Paul were able to escape from them, meaning that they probably had just plain drove off, as it was visible their shirts were ripped apart and they were kissed with giant red lip marks on their faces.
Mutated Human Women?
It is possible that these two Klowns were originally two of the human women that the Killer Klowns were capturing and have been turned into the female Killer Klowns. The scene where Slim encased Debbie inside a balloon was possible foreshadowing to the fact that the women not killed but still brought into the Big Top alive were to have been turned into Killer Klowns. The tip of the iceberg fact where Rich and Paul were kissed wildly by the female Killer Klowns perhaps meant that they were to be impregnated to reproduce Killer Klown offspring and/or the male Killer Klowns were creating sex slaves.