I assume you mean 2 escs plugged into a Y harness and then the throttle channel on the rx. The shoort answer is "Yes." That's how EFlite tells you to set up their P-38. They also say you do not have to disconnect the power lead to one of them. Some people say you should. E-Flite states that leaving the power leads to both escs connected will allow you to run more/bigger servo. I'm not an EE, but I know that when you parallel two batteries you double the discharge capability so it makes sense.
Walt