I will go you 2 better, in that they are all of the same order Anura! Since they were not required to be taken on the ark, and would not be eradicated by a worldwide flood, I would expect a mush greater diversity of these animals than ducks, of which all of their preflood ancestor were destroyed. But still, a frog is a frog!
In fact, the frog presents more of a problem for your theory, in that you must explain the morphing of a water born tailed creature that develops legs, loses the tail, and breathes air through lungs that replaced the feather gills. What is the fascinating explantion that the evolutionist offers for this? Not only did it evolve swimming aparatus, it also evolved land required apparatus, but lost neither! A true wonder of the blind mutation and natural selection mechanism! Hah!!! I've seen the pictures, and read the conjecture, and am nowhere near convinced.
This animal is a testament to the marvelous Creator, who, when the time was right, appeared in the flesh on this earth, to pay the penalty for our sins so we would not have to!
All animals are a testament to their marvelous Creator, as is the marvelous system he created to produce them over millions of year.
And I love the story of the world's frogs living under the floodwaters for a full year.