Your probably thinking of little Shenango in Greenville for the trout. They do swim though, my buddies caught a few right by the spillway below just below the outflow.
I have caught musky, walleye, crappie, perch, bluegill, carp and a few LM bass in upper Shenango below the outflow and the spillway...
French creek has produced all of the above plus pike. The last 2 years FC has proved better than Shenango for me and I live 5 mins from the outflow of pymy, and fished FC more because of the low catch rate on Shenango.
Don't hesitate to take the yak out on pymy main lake to fish either... I fish ALOT out of my yak on the main lake and plan on fishing even more out of it this year (and I do have multiple "regular" boats for pymy). It's a blast on the yak.