OFFICIAL RULING:
They can use all misc. (all heroes can).
They can never use weapons or armour.
POPULAR RULING;
They can use all misc. (all heroes can).
They can use weapons with training skills but never armour.
However, the popular ruling makes Ghouls with Flails pretty OP with A2, T4, Cause Fear.
Therefore, I recommend stealing the Coreheim fix:
They can use all misc. (all heroes can).
They can use weapons with training skills, but suffer -1 A on profile while doing so.
And never armour.
And remember, in all cases, Shields are Armour.