I'm wondering, what would the call be if a player attempted a forearm pass but didn't have their hands connected? would it be a carry ball, a double hit, a foot fault, or 4 hits?
Making a forearm pass without your hands connected is not of itself a fault. Quoting from the official rules, Section 9.3 "Faults in playing the ball":
9.3.3 CATCH: the ball is caught and/or thrown; it does not rebound from the hit.
9.3.4 DOUBLE CONTACT: a player hits the ball twice in succession or the ball contacts various parts of his/her body in succession.
So long as the ball is not caught and is not a double contact, it is a legal play on the ball - that is all that is required, the form of the contact is (deliberately) not specified in the rules.