I've never targeted croaker with lures, but I've caught a few fishing for other species, mainly on small grubs. If the "weakfish" are Greys stick with the smaller leadheads and grubs, if they're Speckled use the bigger baits such as Mirrolures or larger grubs. Any color pattern for both, change if what you're using isn't working. As far as the type of grub Fin S, Storms, Mr. Wiffle, Bass Assasins, whatever is your choice, anything goes.