Trigger warning - puns
Foam Golem's are commonly found being used by spurned lovers spiralling out of control, shitty adolescents who haven't got a clue what they're fucking with and completely deranged masochist that thinks its funny to watch you get smothered to death by a semi-sentient mattress.
The general procedure behind creating a foam golem is that you have to kill someone on the foam, and be casting ritual magickzzzz. Thus binding their animus and rage to the foam, bringing it to life.
Foam Golem have a close relationship with their creator, after all they killed it and brought it back as foam, that shits personal. If a creator gives the Foam Golem an order, but hasn't slept on it in the last 24 hours the Foam Golem will make a morale check, if it fails it will - flip out.
If you get a Foam Golem wet enough its weight will quadruple - with all its actions at a disadvantage, but damage doubled and with resistance to all non magical damage.