Like Fly said, many multi-FX pedals have an expression pedal which can be used as a whammy pedal (often they can also be used as a wah and/or volume pedal too, depending on how you program them). Digitech also makes a pedal called the "Whammy pedal", which is strictly for that purpose. Whammy pedals can often do more radical divebombs than a guitar equipped with the bar.
Mac
"I wish I could play that fast - then I would have the option of not doing that."
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