Froakie is a quadrupedal, frog-like Pokémon. It has light-blue skin, white hands, and a dark blue stripe from the center of its oval head to its nose. It has three fingers and two toes on its hands and feet. Its eyes, which have yellow sclerae, black irises, and white pupils, protrude vertically from its head due to their size. Froakie produces a large mane of bubbles from its chest and back and has two small bubbles on its nose. The delicate yet flexible bubbles, called Frubbles (Japanese: ケロムースKeromousse), reduce the damage Froakie takes from attacks. Despite its carefree attitude, it is vigilant of its surroundings. Froakie is both light and strong, making it capable of jumping incredibly high.
Multiple Froakie appeared in a flashback in Cloudy Fate, Bright Future!. They saw one of their own, who would later become Ash's, as a disturbance to their group due to its strange and distant behavior, and attacked it as a result.
Two Froakie appeared in Till We Compete Again!. One was a starter Pokémon that was offered as a choice for a Youngster to choose from. The second was seen on a video screen in the Lumiose City airport.
In PS549, Professor Sycamore gave Trevor three starter Pokémon so that X might choose one and stop his shut-in behavior. After battling with Y several times, Froakie was taken by her and named Croaky. He later evolved into a Frogadier.
Froakie's foam resembles a "backpack" of sorts, and has also been used in the anime as a makeshift hood, which is more than likely a reference to dorobō (burglars or thieves). In Japanese folklore and culture, dorobō use furoshiki cloth bags to hold stolen goods and mask their identity, referenced in Froakie's usage of its foam. In the older games, the Burglar Trainer class took on the appearance of dorobō. Considering its evolutions, its characteristics, as well as its association with thievery, Froakie may also be based on a ninja.
Froakie may be a combination of frog, froth, croak, and rookie.
Keromatsu is a combination of ケロケロ kerokero (onomatopoeia for a frog's croaking) and 沫 matsu (bubble or foam) or 飛沫 himatsu (spray or splash).