The Round Frog is a Pokémon with a black body and a beige face. In addition to its mouth and two large eyes, its face features two eyebrow-like markings that curve upward like musical notes. Blue, lump-like protrusions adorn both sides of its body, and it sports a slender, blue tail that trails behind it.

The Round Frog communicates with its companions using sound waves, engaging in dialogue through the rhythm of these waves. It vibrates the membrane on its cheeks to emit ultrasonic sound waves—waves that are inaudible to humans and other Pokémon—to alert its friends of potential danger. When beautiful ripples spread across the water’s surface, it signifies that a Round Frog is calling out from beneath the water with a high-pitched voice.