Green’s Dictionary of Slang

(orig. Aus./N.Z.) a condom.

1943		Baker Popular Dict. Aus. Sl. (2nd edn).
1966		Trimble 5000 Adult Sex Words and Phrases.
1988		McGill Dict. of Kiwi Sl. 46/2: frogskin French letter or contraceptive sheath.
2003		McGill Reed Dict. of N.Z. Sl. [as cit. 1988].