Keroro Gunsou Movie 5

Also known as:  Chou Gekijouban Keroro Gunsou Tanjou! Kyuukyoku Keroro Kiseki no Jikuujima de Arimasu!!, Sergeant Frog Movie 5

The story of the 5th Keroro Gunsou anime film revolves around a curious stone figurine, shaped like Sgt. Frog, that Sgt. Frog's friend Fuyuki comes across. Uncovering the secrets of the figurine leads the two and their allies on an adventure at the massive stone statues of Easter Island. (ANN synopsis)

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Producers, official website and other details: AniDB, ANN. Search on: Wiki.