The Collaborative International Dictionary of English v.0.48:

Batrachian \Ba*tra"chi*an\, a. (Zool.)
   Pertaining to the Batrachia. -- n. One of the Batrachia.
   [1913 Webster]

WordNet (r) 3.0 (2006):

batrachian
    adj 1: relating to frogs and toads [syn: anuran, batrachian,
           salientian]
    n 1: any of various tailless stout-bodied amphibians with long
         hind limbs for leaping; semiaquatic and terrestrial species
         [syn: frog, toad, toad frog, anuran, batrachian,
         salientian]

Moby Thesaurus II by Grady Ward, 1.0:

45 Moby Thesaurus words for "batrachian":
   amphibian, anguine, bullfrog, colubriform, crawling, creeping,
   croaker, crocodilian, frog, froggy, hoppytoad, hoptoad, lizardlike,
   newt, ophidian, paddock, polliwog, repent, reptant, reptile,
   reptilelike, reptilian, reptiliform, reptiloid, salamander,
   saurian, serpentiform, serpentile, serpentine, serpentlike,
   serpentoid, slithering, snakelike, snaky, tadpole, toad, toadish,
   tree frog, tree toad, viperiform, viperish, viperlike, viperoid,
   viperous, vipery