From Nookipedia, the Animal Crossing wiki
Frobert (コージィ, Koji) is a jock, frog villager in the Animal Crossing series. His name is a portmanteau of the name "Robert" and the word "frog". His initial phrase is a play on the word "ribbit", the sound a frog makes. He was originally in Doubutsu no Mori e+, and later in Animal Crossing: Wild World and Animal Crossing: City Folk, like Victoria the horse, another villager from Animal Crossing series.
Frobert is a frog with a green skin color. He has black and olive spots on his cheeks, and he has buck teeth. Like all frogs, Frobert's eyes protrude from his head. The tips of his hands and feet are olive, like the spots on his body. He wears a Gracie Top.
Below is a brief description of the jock personality. For more information, click here.
As a jock villager, he will have a key interest in fitness and sports, appearing arrogant when talking about the subject and rude towards other villagers and the player, saying something along the lines of, "Have you been putting on a little flab lately?". He will also appear small-minded and slow-witted, often finding small things difficult to comprehend. He will get along well with other jock villagers, but may annoy snooty and cranky villagers, who will dislike his comments about their fitness and athleticism. He will, however, get confused when talking to lazy villagers, not understanding their choice of lifestyle. He mostly talks about working out but likes to chat about other things as well.
In Animal Crossing: Wild World, his house has a mat-like carpet with a citrus wallpaper. He has some fruit furniture and a clothes line. He does not have a stereo with music playing, but once he obtains one it will play My Place.
In Animal Crossing: City Folk, he has a citrus carpet, Kiddie stereo which plays My Place, a kiddie couch, the full Watermelon Set including the Watermelon Chair, Watermelon Table, and Melon Chair, the full Pear Set. And lastly he displays the Clothesline Pole, Sea Bass and a Slim Quazoid.
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