Pekopon

From the Keroro Wiki

In the anime and manga series Keroro Gunso, Pekopon / Pokopen is what aliens call Earth.

[edit] Etymology and issues

In the manga, Earth is referred to as 'Pokopen', whereas in the anime, it is 'Pekopon'. "Pokopen" is a derogatory word the Japanese used to describe China during the Sino-Japanese Wars, and has since been banned from TV programs by the mass communications authority in Japan.