what rest. in nola serve crawfish?

You should just go to a seafood market and buy them. You can buy them at Big Fisherman on Magazine and eat them outside across the street at the pizza place just buy beer from them.

If you need a restaurant and it has to be in NOLA try Frankie & Johnny's uptown or Somethin Else cafe in the FQ. Going out to Jefferson Parish you will have better options.