Is boiling water poured over frozen berries enough vs. bacteria?
From the comments, Henrik noted that there is a parasite in Sweden (called "Dvärgbandmask" in Swedish) that contaminates wild fruit.  This is a type of tapeworm called "Echinococcus" in English.  Its eggs can cause a parasitic disease called Echinococcosis or hydatid disease.  According to this article, freezing the eggs to very low temperatures and/or freezing the eggs very rapidly is fatal to them.  Given that modern "IQF" freezing methods for berries bring the fruit very quickly to below -20°C, I'd say that the danger from echinococcosis is very low (much lower than eating unwashed fresh fruit).

As for risks from bacteria, these are also very low because the process of preparing the fruit for freezing and then subsequently freezing them kills the majority of any present bacteria.