Yes, lifter ticking often goes away as an engine warms up and as you accelerate. This is because lifter tick is often caused by a brief lack of lubrication at the top of the engine because hydraulic lifters are operated by oil pressure. When the engine is off oil can drain from around and inside the lifters. It can take a few minutes for the oil to be pumped back around the top of the engine after it is started and once warmed up and properly lubricated the lifters will stop ticking. A sign of worn or damaged lifters is when they continue to knock or tick after the engine has warmed up and the car is driving.