Smoky Jungle Frog 
Smooth Guardian Frog 
Smooth Newt 
Snouted Grassland Frog 
South American common toad 
Southeast Asian Wood Frog 
Southern banded newt 
Southern Brown tree frog 
Southern cricket frog 
Southern leopard frog 
Southern red-backed salamander 
Southern toad 
Southern two-lined salamander 
Spinomantis fimbriatus 
Spiny Slender Toad 
Spiny toad 
Spiny-headed tree frog 
Spot-legged Tree Frog 
Spotted Bush Frog 
Spotted Grass Frog 
Spotted Litter Frog 
Spotted salamander 
Spotted-thighed tree frog 
Spring peeper