Strictly speaking, the levers are not throttles anyway, though the term lingers on in some old Boeing books. Throttles are usually associated with piston engines. 'Thrust levers' is the more technically-correct term for those thingies that you push forward to go faster.
Most operators use the simple call-out "thrust set" as confirmation that a) the FMA caption says whatever it is supposed to and b) the N1, EPR (or whatever parameter is applicable to the type) is where it should be. The danger with terms like 'throttle hold' is that the pilot will fixate on the caption displayed to the exclusion of other indicators which are more critical.