@Tafin Hah! I think I can make out Spitter (1960) on the rock; and that's probably Gombe (1988-2001) on the rock. The juvenile next to him? Maybe Chunga? It looks about four (born 1991) and the chimpanzee next to it (likely its mother) has greying hair. This makes me think it's not one of the others born 1991/1992 - Mali, Kuma, Kibale or Kike as they all had mothers aged 9-13 at the time of their birth vs. Chunga's mother, Chiki, who would have been 26 in this photo.
