The answer to 'hydro jetting frozen' is that hydro jetting is generally not recommended for frozen pipes. Hydro jetting is a high-pressure water technique used to clear blockages and buildup in pipes, but it can actually cause more damage if the pipes are frozen. Frozen pipes are more fragile and can crack or burst under the intense pressure of hydro jetting.
Instead, the best solution for frozen pipes is to carefully thaw them using a space heater, heat lamp, or even hot water poured over the frozen section. This should be done slowly and carefully to prevent the pipes from bursting. If the pipes are severely frozen or you're unable to thaw them safely, it's best to call a professional plumber who can properly assess the situation and use the right techniques to unfreeze the pipes without causing further damage.