Where is the anime with a frog dog? - briefly
The anime you're referring to is likely "Keroro Gunso" (also known as "Sgt. Frog"), which features a frog-like alien character named Keroro. This popular series is created by Mine Yoshizaki and has been adapted into various forms of media, including manga and anime.
Where is the anime with a frog dog? - in detail
The anime you're referring to is likely "Gintama," a popular and highly acclaimed series known for its unique blend of humor, action, and science fiction elements. The character in question is Kagura, who is often depicted with frog-like features, particularly her tongue, which she uses to lick objects or people as a sign of affection or to show her enthusiasm. This quirky detail adds to the overall eccentricity and humor that "Gintama" is famous for. The series follows the adventures of Gintoki Sakata, a former samurai who now works as a freelancer alongside Kagura and Shinpachi Shimura in an alternate Edo period where aliens known as Amanto have invaded Earth. If you're looking for an anime with a memorable "frog dog" character, "Gintama" is the one to watch.