Green’s Dictionary of Slang

(Aus.) a fool; also used attrib.

1941		Baker Popular Dict. Aus. Sl.
1946		E. Hill ‘Santa Claus of Christmas Creek’ in Rees Aus. Radio Plays 197: Who’s Dolly-pot Mick?
1955		N. Pulliam I Travelled a Lonely Land (1957) 146: We’ve known for two years it [i.e. the Olympics] was coming and we’ve got two years left to go — and we sit here like a bunch of dollypots.