Confused about "true toads"

[Herpin Man]

"Toad" and "frog" are not scientific terms, and they don't necessarily have specific meanings. Toads are generally dryer, rougher, and squatter than frogs, but there is considerable overlap. For example, Sheep frogs and narrow mouth toads are both in the same family, and very similar in appearance. Toad and frog are just words.
"True toad" is just a phrase which attempts to specify the Bufonids- presumably necessary due to the vague non-specific nature of the word "toad".