Sgt Frog Vol 4

Sgt Frog Vol 4 by Mine Yoshizaki. A Comedy manga rated Teen, published in English by Tokyopop in 2005.

Sergeant Keroro, a frog-like alien, is sent to Earth to lead an invasion, but is captured by the Hinata family and becomes their housekeeper. Between chores and building Gundam models, he still plots to conquer the planet.