Blue (axanthic)
A variant of American Bullfrog (Lithobates catesbeianus)
Representative American Bullfrogphoto — a dedicated image of this exact morph isn't available yet.
Rare blue or teal individuals caused by axanthism, a recessive deficiency of yellow pigment that occurs sporadically in wild populations (roughly one in tens of thousands of frogs); striking but not a stable established morph line.