The 青蛙 is a background 小动物 that only serves as environment flavor and spawns on the surface 丛林 at any time. Due to them having only 5 HP and no defense, they are often killed instantly by other mobs or the player itself. A Frog behaves like the other common ground critters - it moves around aimlessly as a bunny, penguin or squirrel would, until despawned or killed. Gold frogs may also spawn.
It can be caught with a 虫网 to be carried around in the inventory and released later, or crafted into a 蛙笼 to be used as furniture. Once crafted, the caged frog cannot be released again, and when placed down it moves around inside the cage as it would do outside.