They sure are. My pond is lousy with the biggest tadpoles I've ever seen. I swear that this is not an exaggeration: the largest ones get to be the size of grapes before they start looking like frogs. Problem is, my cruddy camera can't catch them because they are under the surface:
Unfortunately, I have to zoom in from far away or else they jump in, so they are a bit blurry, but these 3 seem to be enjoying each other's company:
Oh my gosh, I'm starting to feel the need to get my own frogs now :( Look what you've done to me!
If your cats are anything like my dogs, you might have to guard them closely...