Etymology
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natterjack (n.)

common toad of western and north-central Europe (rare in Britain) with a yellow stripe on its back, a distinctive running gait, and a loud mating call, 1769; the second element probably is the proper name jack (q.v.); for first element, Weekley suggests connection with attor "poison" (see attercop); it also could be echoic of its croaking.

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Definitions of natterjack

natterjack (n.)
common brownish-yellow short-legged toad of western Europe; runs rather than hops;
Synonyms: Bufo calamita
From wordnet.princeton.edu