Hi Naikii,
That's very interesting what you have found...It is rather common to see new small bushes of a variety of plants growing on the 'cups' left once you cut the palm stalks. Birds mostly sparrows spend the night on those cups eventually leaving behind fertile seeds from a variety of fruit which with the correct surroundings of media/dust/ humidity and nutrients quickly develop into thick bushes,... but figs?
This may mean that somewhere around that area there are caprifigs and fig wasps pollinating whatever varieties they found (Smyrna or Common alike)... the birds, rodents, etc ..eat those figs and drop the seeds everywhere and these under the right conditions may give birth to a new fig.
I would not be surprised once, back in time, by about the same years where the Caprifig and Smyrna fig varieties (Sarilop mainly) were being introduced in Americas and South Africa, similar efforts were made in Australia.
http://trove.nla.gov.au/ndp/del/article/37410326
Earlier this season, found a 'parasite' fig tree growing strongly, sucking nutrients from a palm, certainly originated as the ones you saw, but with edible black figs. There are pictures and text describing this fig, which for the moment I have called sparrow fig. The chances of finding in the wild an edible fig born from seed, are very small.
Francisco