No, all your 3 passes have to be in the same park. If park hopping, a good strategy is to select your 3 FP's for your afternoon park when lines will be longer.
What we do is hit the first park in the morning and do whatever we want while lines are decently short. Then after we leave and head to the second park later in the afternoon, we already have our passes set up and don't have to try to worry about getting a 4th or 5th FP or wait in long lines.