Mathew,
Er, if your freezer isn,t big enough, you could of course send them to me, and I will look after them for you!
Take care that there is no meat, or fat left on the tails, as this will cause you problems later on, unless you treat it with borax, or similar. The lads have given good advice on how to clean the feathers, but you can also use an insect spray on them for good measure.
I would not freeze feathers, even if it does kill bugs, better to do as above, and allow them to dry in a dark warm environment. The top shelf of the airing cupboard is ideal, as long as your missus cannot see or reach it!
Best wishes,
Sam