amphibian anguine batrachian coasting colubriform crawling creeping crocodilian flow flowing froggy glide gliding lizardlike ophidian repent reptant reptile reptilelike reptilian reptiliform reptiloid sailing saurian serpentiform serpentile serpentine serpentlike serpentoid skating skiing skim sledding slide sliding slipping slither snakelike snaky sweep sweeping toadish tobogganing viperiform viperish viperlike viperoid viperous vipery