Green’s Dictionary of Slang

spridger n.

also spridge, spridgy

(Aus.) a sparrow, esp. the (introduced) House Sparrow, Passer domesticus.

[Aus]Dly News (Perth) 16 Jan. 6/5: If the bird were a sparrow, in Sydney and Brisbane it would be called a sprag or spridger; in Adelaide a spoggie; in Melbourne a spriggy.
[Aus]S.J. Baker Aus. Speaks 104: sproggy, spudgy, or spridgy, a sparrow.
Birding-Aus 13 Nov. 🌐 I have been trying to do some research on the origins of sparrows in Australia and their other names such as ‘spoggies’ ‘sproggies’ ‘spridge’ and so on.