- "Only found at the Shibuya River, these frogs belch out a massive batch of bubbles."
- — Noise Report
Southerfrog has no passive capabilities.
- Leap: The Southerfrog leaps onto the player, and then leaps off to deal moderate damage. The leap is homing to a degree and so it is difficult to avoid by moving normally. However, dashing while the frog is attempting to land on Neku, or before it has leapt off, is usually a good method of avoiding taking damage from the attack.
- Bubbles: After standing still to inflate its throat sac, the Southerfrog releases a number of bubbles that inflict damage on contact; damaging the bubbles will pop them (the bubbles are considered airborne, so ground-based attacks will not destroy them). Attacking the Southerfrog while it's inflating its throat sac cancels the attack altogether.
The Southerfrog, with its average attack speed, shouldn't be too much of a problem for a player due to the late stage of the game that they are encountered.
The Southerfrog's name is a play on "southern" and "frog". Considering the music-themed names that other Noise have, "southern" is likely meant to refer to the Southern United States, which is the birthplace of a number of musical styles, including country music, jazz, and rock and roll.