I don’t have any knowledge of rafts and their legality, so my comments refer to float tube fishing.
Based on your Nazareth location, seasonal trout fisheries in PFBC and DCNR lakes exist in Minsi Lake, Northampton Co, Leaser Lake, Lehigh Co, Kaercher Ck Dm, N Berks Co, and Locust/Tuscarora Lks, Schuylkill Co. Of these, Locust holds trout for the longest period into the summer. Tuscarora is only stocked in fall, but a good number of trout hold over into the spring plus you may fish it during the closed season (but all trout caught during the closed season have to be released).
Leaser is poor in that catches are pitiful based on WCO observations and an opening day angler survey, yet it continues to be stocked for opening day. That said, a WCO once saw a kayaker do well at one and only one particular spot, so you might have some luck from a tube.
The telling question from a WCO who covered the lake for a year was; “does anyone ever catch any trout there?” I would add that a tube angler does well on Tiger Muskellunge and sometimes bass there, but he does not fly fish.
Going farther north to Pike Co, Little Mud Pond provides excellent spring dry fly fishing in the evening, but streamers work well in the late afternoon and based on my limited observations and its limited access, it is way underfished. That’s great for the individual angler, but not good programatically.