If a minor had amnesia and no family came to get them, would they be put into foster care until family was found?

Not at first. They would first figure out the cause of the amnesia and treat the minor medically or psychologically (often putting them in the loony bin, amnesia is very rare).

No. They would be sent to a psych ward at a hospital. A child with amnesia needs medical attention - not a foster family.

Yes, in one form or another depending on their mental state.

Yes.

yes

they old " fake amnesia " will last a day or two .