True frog and Wood-frog

True frog noun - Insectivorous usually semiaquatic web-footed amphibian with smooth moist skin and long hind legs.

Wood-frog and true frog are semantically related. In some cases you can replace phrase "Wood-frog" with "True frog", this phrases are similar.

Wood-frog noun - Wide-ranging light-brown frog of moist North American woodlands especially spruce.

True frog and wood-frog are semantically related. You can use "True frog" instead a noun phrase "Wood-frog".