Size 11 and size 9 are big honking lures. I think primarly pike would be what they would work on, but if walleyes are feeding on large forage they might be okay for them too, or possibly lake trout.
I think to get these jigs to swim you'd need really heavy line, like 14 pound test mono or fluorocarbon. The best size for pike, lake trout, and walleye is #7. Sizes #3 and #5 are best for finesse walleye, bass, finesse trout, and large crappies and perch.
Tyler