This is one possibility out of a few.
FROG
FRAG
DRAG
GRAD
GOAD
TOAD
a 4 letter word for a thin frog is a toad
A puddock can mean a small enclosure for animals (paddock) or a frog like amphibian.
toad
Usually a frog is smaller and smoother than a toad
Its a toad but you could say its a frog
A favorite frog book is Frog and Toad Treasury. This book includes 3 stories about frog and toad.
The cast of Frog and Toad Together - 1987 includes: Will Ryan as Frog Hal Smith as Toad
its a toad (bufonidae)
Toad.
No, to be a proper noun it has to b naming a specific amphibian. A proper noun wouldn't be frog, or toad, either, it would be Jenny the frog, or Bert the toad.
Frog
A frog