What does "true frog" mean?

Any frog of the large family Ranidae, found worldwide, typically with smooth and moist skin; large, powerful legs; and extensively webbed feet.

What is a synonym for "true frog"?

Common synonyms include: frog, frogs, ranid.

noun

noun ·Rare ·Advanced level

Noun

1
Any frog of the large family Ranidae, found worldwide, typically with smooth and moist skin; large, powerful legs; and extensively webbed feet.
2
insectivorous usually semiaquatic web-footed amphibian with smooth moist skin and long hind legs wordnet

From true (“sensu stricto”) + frog.