Yup, toads are nasty tasting, they have these
glands on their backs that provide them with a
defense mechanism.
Bullfrogs were first brought out West as menu
items. They escaped the ponds where they
were farmed and now are all over the place.
Plus ponds shops and nurseries started
selling the tadpoles for pond pets.
These are probably great grandchildren of
ones I got when we first put in the pond.

k :-)