Do you mean have a portrait on the side of the screen? if so, then I don't think so, because they can only be intereacted with my the child they're 'imagined' by, so to speak, but I'm sure someone will correct me if I'm wrong.
You can control them by creating an Imaginary Friend Metamorphium on a chemistry set. It basically makes them 'real'. Other than that, though, I doubt they're controllable.
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When they become real then yes
Was this really worth a new thread?