In one instance, an Instagram account posing as a legitimate registered charity in Fitzroy Crossing was asking donors to buy Amazon e-gift cards.
Residents in the town of Derby have been left frustrated by supply shortages after the flood damage isolated the town.
Shire president Geoff Haerawa said the town had received dozens of pallets of food and essentials, and was working to get products on shelves.
“The shelves have been empty in our main supermarket here,” he told the ABC.
“I have spoken to the manager, I have spoken up the line, and they’re doing their darndest to get product on the shelf.
“There’s always a bottleneck somewhere and that’s the fact that the road is out, and we’re having to rely on barges and an air bridge coming across from Broome and other areas.”
About 150 evacuees – some from remote communities – were brought to Derby, prompting the introduction of temporary alcohol restrictions which have angered some locals.
The state government has outlined plans to rebuild the collapsed Fitzroy Crossing bridge after the floods destroyed 38 homes and damaged dozens more.
A barge system will be implemented to allow traffic through while a low-level floodway crossing is built over the next four months.