Northern slimy salamander 
Northern Torrent Frog 
Northern two-lined salamander 
Northwestern salamander 
Nyctibatrachus beddomii 
Nyctibatrachus grandis 
Nyctibatrachus petraeus 
Nyctibatrachus sanctipalustris 
Nymph Tree Frog 
Oak Toad 
Odorrana indeprensa 
Olive Frog 
Olive Snouted Tree Frog 
Olm 
Oophaga anchicayensis 
Oophaga solanensis 
Oriental Fire-bellied Toad 
Ornate Burrowing Frog 
Ornate Nursery Frog 
Osteocephalus mutabor 
Pacific Giant Salamander 
Pacific tree frog 
Paddy Field Frog 
Painted Antnest Frog