Etymology From frog + -ly (suffix forming adjectives).
1
Of, relating to, or characteristic of frogs.
1877, "The Centennial Frog", The Centennial Frog, and Other Stories, publ. by Clazton, Remsen & Haffelfinger, page 14. Lieutenant Frog's rich frogly voice / Husky grew with his great theme;
[…] and when at last they arrive at frogly maturity, they escape into the world through the mouth of their father.1901, Grant Allen, In nature's workshop:
2 more examples
Yet as some of the verses show, Aristophanes knew a good deal of actual frogly habits.1945, American Nature Association, Nature magazine:
On those sacred nights you can rise in frogly glory to confront the villains who are poisoning my subjects.2008, Bruce Coville, Oddest of All:
Toadly awesome!" "Not toadly," said Michael, laughing. "Gorfman's a frog." "It's frogly awesome," said Charu.2009, Gail Donovan, In Memory of Gorfman T. Frog: