regular black lug are gutted before being frozen but not sure about gutting a blow bag?
To be honest I always thought lug were only called blacklug when they turn black after gutting & prep for storage etc,?
While on the subject of lugworm, two packs of Oiled Black Lug I received in an order of mixed baits seem to work very well!
An unopened pack will keep for 3-4mnths in the tackle box?, they apparently give off a much better scent trail/oil slick than fresh?
We fished with a couple of oiled blacklug and a whole baby squid stuffed with peeler double hooked on size 3/0 Aberdeens.
Oops!, rambling off-topic again!

If anyone can enlighten me regarding the freezing of blowlug though at all please I'd be very grateful
Cheers, Andy