Partner of Frog in a children's book series (4)

I believe the answer is:

toad

(Other definitions for toad that I've seen before include "Warty amphibian" , "Amphibian with warts" , "Froglike animal or repulsive person" , "Ancestral hall on River Bank" , "Wind in Willows hall-owner" .)

I've seen this clue in the USA Today.

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