Tiny Kong is the female Kong who first appeared in Donkey Kong 64.
Donkey Kong 64, released for Nintendo 64 in 1999, expanded the playable Kong team to five characters: Donkey, Diddy, Lanky, Tiny, and Chunky. Tiny is a young female chimpanzee and the younger sister of Dixie Kong. In the game, Diddy Kong rescues her in the Angry Aztec area, after which she becomes a playable character with her own abilities.
Tiny’s special move set distinguishes her from the other Kongs. Using a potion barrel, she can shrink into Mini-Monkey form, enter small passageways, and use her Pony-Tail Twirl to slow her descent. She carries a Feather Crossbow and plays the Saxophone Slam as her musical instrument.
Dixie Kong is an understandable wrong answer because she is also a prominent female Kong, but Dixie debuted earlier in Donkey Kong Country 2. Candy Kong and Kiddy Kong likewise predate Donkey Kong 64. Tiny’s debut was specifically in the 1999 Nintendo 64 game.