the.com/tree frog

means A small frog species adapted for life in trees and shrubs, typically equipped with sticky, expanded toe pads for climbing instead of strong swimming legs.

from Straightforward compound of 'tree' and 'frog' — English doing what it does best, just nailing two nouns together to describe exactly what you're looking at. The word 'frog' itself reaches back through Old English 'frogga' to older Germanic roots, likely echoing the croak itself. No hidden story here beyond that: the name just points at the animal and the real estate it chose.