Since the girls have been little they've loved puppets and especially stuffed animals. They like when they're in the bath and you wash them with one of the many puppet washcloths (particularly "ze lion" and "mr. monkey") and we have a multitude of different voices for their favorite animals. I noticed recently that when they pretend like they're babies they talk in a different voice, and when they play with dolls they talk in a different voice, and when they play kitchen they use a different voice ... here is them playing with their stuffed dogs tonight.
By the way - whenever I ask them what the stuffed animal or baby's name is ... it's always whatever color it is (so if it's a green frog, they'll say hi, I'm green).
It's funny because Zach wasn't ever into this kind of playing, but he can make every kind of zooming car or truck or airplane noise you can imagine!