My next door neighbour (now 92 years old) has this version:

What's the good of squawkin'
When you're stony broke and walking
And your tucker bag is floatin' like a flake
When your billycan is leakin'
And your battered boots are squeakin'
That's the time you think of mother and the scones she used to bake.

He said he probably learned it at school but he served with the RAAF in the Korean War and admitted he might have learned it there.