A baby bullfrog, a leopard frog, and a pickerel frog : r/herpetology

Ohio's 15 species of frogs and toads at a glance

Big mama European Common Frog and a breeding pair of common toads : r/ herpetology

Is this a Northern Leopard Frog or a Pickerel Frog? I'm leaning towards Northern Leopard. Found in Acadia National Park, ME : r/herpetology

10 Types of Frogs Found in Pennsylvania! (ID Guide) - Bird Watching HQ

Herpetology

Kansas Herpetofaunal Atlas

Guide to the Amphibians and Reptiles of Connecticut

Baby pickerel frog/leopard frog I found in my yard : r/frogs

Pickerel or Leopard frog? : r/herpetology

Northern leopard frog (Lithobates pipiens): COSEWIC assessment and status report 2009

Pickerel Frog (Lithobates palustris) – Amphibians and Reptiles of Iowa

American Bullfrog - Montana Field Guide