E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Dodipoll.
As wise as Dr. Dodipoll (or) Doddipolei.e. not wise at all; a dunce. (Doddy in dodi-poll and doddy-pate is probably a variant of totty, small, puny. Doddy-poll, one of puny intellect.)