According to the DVD commentary that I was watching last night (hence today's post), it is in the production notes as "ANGRY MACHINE". It was just a noise the animators slapped in until SFX could find something more appropriate, but everybody loved it so they kept it.
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However, I do not have a toad :(
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The noise it makes is one of the best sci-fi noises evah.
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BZZZZZEOWOWWZZZZZZEOW