A lot of lakes I used to fish in had no minimum size for pike (to reduce the population). Hammer handles were just that, pike that looked like hammer handles!
IMO, walleye are not fatty (or oily) enough to take well to smoking.
I smoke salmon, pike, suckers, whitefish, trout (other than brookies, which other than Grayling are true trout, rainbows, browns and lakers are actually salmon), smelt, splake and perch (sunfish like bluegill, pumpkin seed, etc)
I might try carp one day*wink*