Gottog- Have never frozen sand fleas, only peeler crab.As with most already soft or easily damaged baits, preparation is the key, everything had to be just right to get the crabs to be any good for bait when defrosted.Blast frezzing is the best method, this virtually frezzes the bait instantly, though not that many people have one, suprise suprise, the next best thing is a quality frezzer, if poss