Hey that is really cool! If I were you I would spend my time recording my own audio tracks rather than trying to find some already done that were appropriate. You would need a decent USB microphone and a quiet place to do the recording but even with some of the free audio software out there like Audacity you can add some amazing effects to your own voice. I did this for a talking skull this past year and had people in stitches laughing with some of the tracks I came up with. You could start with "Whats a matter - never saw a talking totem pole before?" Please post some videos with whatever you end up with - we would love to see them!