Xoreth wrote:

Our backyard in suburban Melbourne is severely overgrown. Grasses,
weeds, etc.

Is borrowing, or hiring, a goat or two, a viable thing?

Does anybody offer such a service?

Isn't there a rent-a-pet service or something similar.

Aaah, some guy rents out chooks, I think.
He might do goats.

Of course, my understand is that goats only work when you have
absolutely nothing of value. If you want to keep something, they
dutifully eat it first {:-).

You might be better to buy a feral goat form somewhere, put it in your
back yard and let it go when finished with it. Urbanised/farm goats will
probably be fussy eaters.