In the US, "true friend" is the only one used in the sense of an exceptionally good friend. "Actual friend" cannot be used in this sense - or in any sense in English. "Real friend" is heard in the US, but in a different sense: the person is a good, by not exceptionally good, friend.
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.