How do you transform a creature into a frog in super Scribblenauts

Create a witch, tap the witch, tap remove, and then grab the wand as fast as you can. The witch can't attack you without its wand, no worries about it. Then, delete the witch. The easiet way is just typing in MAGIC WAND in your notebook. Not very complicated. Next, create any small animal you want and then use your wand on it by tapping the animal and then shoot it. There, the animal has turned into a frog.
Hope I helped!