Island Sisters

The Twin Nuts (also known as the Twin Sisters from the South Seas) lived a peaceful existence on the South Sea Island, a tropical island located in the South Seas, singing to keep the Mosugaba caterpillar content, until one day dark clouds appeared and they were both captured by Nightmare Enterprises in the episode Caterpillar Thriller. King Dedede ordered them up, telling them to sing for him to summon Mosugaba, and, indeed, Mosugaba came to Dream Land - intent on rescuing them. While Kirby and Mosugaba fought, Tiff and Tuff found the Twin Nuts locked up in a cage within Dedede's room and freed them, and had them sing for Mosugaba, which calmed him down. Thanking Kirby and his friends for their help, the Twin Nuts returned home with Mosugaba.

The Twin Nuts are voiced by Yuko Mizutani and Madoka Akita in Japan.

Physical Appearances
The Twin Nuts share the same physical appearance with one another. They are tiny, tan-skinned women with light blue hair and sparkly eyes, wearing only round yellow hula skirts and torn yellow bras, green shoes, orange earrings, and pink flowers on their heads, and nothing else.

Trivia

 * The Twin Nuts are (probably) based on the tiny twin sisters in the Mothra movie. They are (probably) called the "Twin Nuts" because the actresses in that movie were also a very popular singing group in Japan called 'The Peanuts'.
 * The Twin Nuts later made cameo appearances in the episode "Tooned Out" as model figurines as well as pictures printed on magazine covers, both of which can be seen while the Otakings are busy making their cartoon within Dedede's dungeon.