Kenneth Grahame's gentleman amphibian from The Wind in the Willows (4)
I believe the answer is:
toad
(Other definitions for toad that I've seen before include "Ugly creature, jewel in head (AYLI)" , "Ancestral hall on River Bank" , "driver of reckless repute" , "Amphibian with warts" , "Stout-bodied amphibian" .)