Right. This has already been discussed. A clear answer has already been found. Read the thread that I linked to, and you'll find that JWolf very early on presents an argument that explains "yes, Foehammer does stun its target when thrown".
JWolf's argument is never disproven, despite 20+ pages of fervent argument. A lot of people rail against, it, and refused to believe it, but the could find absolutely no justification in the rules to claim that Foehammer does not stun its target.
And Leez, as I've already said, there are many examples of weapons that have rules outside their shooting profile. And I'm not talking about just rending or something. From the last page of the old thread, here are some examples;
All of these weapons have properties that, if you only used their profile, would not be used. Just looking at these examples makes it crystal clear that even if Foehammer does not note in its profile that it stuns its target, that means nothing. It does not lose the rule.The Tau cyclic ion blaster, which mentions in the long-form description that rolls to wound of 6 count as AP1 - but makes no mention of this in the weapon profile.
The eldar singing spear, which mentions in the long-form description that it has Strength 9 against vehicles - but makes no mention of this in the weapon profile.
The eldar wraithcannon and D-cannon, each of which mention in the long-form description that rolls to wound of 6 inflict Instant Death - but make no mention of this in the weapon profile.
The space marine cyclone launcher, which mentions in the long-form description that it may be fired together with a storm bolter - but makes no mention of this in the weapon profile.