[LunaTheHamster1]

i see lots of people making treats/boredom breakers out of flour and water, so in theory it is safe.
in practice it depends on if they are adding anything else like salt and what type of flour it is.
it's also something i wouldn't be giving to my hamsters often but as a one off every now and then I think it's ok.(not an expert on this though) Others may have a differing view.