Rename the upcoming 'frogs' to 'toads'

I believe that the definition of frog does not correctly reflect the biology of the mob; frogs typically have legs that are much longer than their bodies and tend to hop around, toads on the other hand have much shorter legs and usually walk around. I think renaming frogs will help give some clarity as to the direction this mob is taking and also allows for either modders or Mojang to expand upon the 'amphibean' class of mobs in the future by adding, smaller, frog mobs (poison dart frogs, tree frogs, etc...). :)