Wogs down under

It seems that we and the Australians, as much as we and the Americans, are two nations divided by a common language.
Wog is, to us, an impermissibly offensive term of abuse for blacks and Asians. Not so, apparently, in Australia, where it can be used harmlessly as simply a term for anyone from a foreign land. It can also refer to a minor ailment, so that employees calling in sick can legitimately offer the excuse that they are “in bed with a wog”.
Discovering this impelled me to some research. My subscription to the Oxford English Dictionary Online has expired so I cannot check whether it has properly recorded these usages; it probably has. My Shorter Oxford Dictionary (1983 edition) has it in the addenda as “a contemptuous name for a foreigner, esp. one from a Middle Eastern country”, while my Concise OD (1981) has this and also, as a separate entry “(Austral. sl.) Infectious illness”.
The great Partridge, thorough as always, gives all the possible derivations and several additional meanings (including "Australian nursery term for a very young child, from English dialect pollywog, a tadpole"), and confirms that “ten million Australians regard the wog loosely as a heavy cold with aches and pains…”
The reference to nursery term for very young child drove me on to look up sprog, of which this is one of the meanings. Oddly enough, this also involves the Ranidae as "it may be a reversal of frogspawn". Then, on the same page, my eye caught spug, and I learnt with interest that this is a……
That’s quite enough idle browsing…stop it NOW.