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The Snaketongue is simple: a vertical W step followed by the outward turn is simply vWvyafsW (same as the manticore but with v prepended to each component).

The ship is trickier, as the first step can be in any direction and by the second step there's no way to specify which is the right twist (as there hasn't been a bend yet and l and r are relative). It may be worth special‐casing z and q here too(?) but meanwhile it can be done in a slightly hacky way involving the mp modality trick (i.e. a square that can either be empty or a mount, so it doesn't matter what's there). That gives two solutions: FvmpasyazW which (other than the F step) moves one forward, ignoring wahatever is there, turns 90° for another W step, then turns 90° again for the rest of the Rook move; or alternatively smpyasW which steps one space sideways, ignores what's there, then turns 90° and continues, now vertically, as a rook (note this latter one already includes the F step)

@HG:

quite incidentally while trying some of these, I input yafqF as a move, which seems to give a pandacub (Gilman's name for the forward‐only Slip‐rook, ft[WDD]) for some reason? Not sure exactly what I expected (though sth gryphon‐like would have made sense I think?) but it definitely wasn't that.