Backhand posture is king
Use the backhand as a standard stroke for the return at Frescobol. This is the easiest, because it is the best way to regulate the speed of the ball.
You can support the racket in hard, aggressive balls with your second hand by placing your left palm against the sweet spot from behind. This prevents the face from twisting if the ball does not hit the center of the club blade.
If you hit the ball with the forehand, i.e. the open face, you need more feeling and good coordination to play the ball back at the right angle. In addition, control of the face is more difficult. But you can put more pressure in the punch with the forehand and play hard butterfly balls. In experienced Frescobol games you can often see that one player only hits hard balls with the forehand and the other partner only returns with the backhand.