The Collaborative International Dictionary of English v.0.48:

Forkbeard \Fork"beard`\, n. (Zool.)
   (a) A European fish (Raniceps raninus), having a large flat
       head; -- also called tadpole fish, and lesser forked
       beard.
   (b) The European forked hake or hake's-dame (Phycis
       blennoides); -- also called great forked beard.
       [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Tadpole \Tad"pole`\, n. [OE. tadde toad (AS. t[=a]die,
   t[=a]dige) + poll; properly, a toad that is or seems all
   head. See Toad, and Poll.]
   1. (Zool.) The young aquatic larva of any amphibian. In this
      stage it breathes by means of external or internal gills,
      is at first destitute of legs, and has a finlike tail.
      Called also polliwig, polliwog, porwiggle, or
      purwiggy.
      [1913 Webster]

   2. (Zool.) The hooded merganser. [Local, U. S.]
      [1913 Webster]

   Tadpole fish. (Zool.) See Forkbeard
      (a) .
          [1913 Webster]