Ramsdm2003 - Welcome to Everything Dulcimer.
I don't know your level of experience, but you're not going to find much, if any, "canjo" tab. You will find dulcimer/diatonic tab that can be played on the canjo.
Second, Rocky Top is a modern song, which is undoubtedly still under copyright protection. The chances of a dulcimer music book creator paying royalties to create tab or a modern tune are not real good. It's probably best if you try to pick the tune out yourself on the melody string.
That being said, I did see Rocky Top on the sniff.numachi.com website and apparently there is dulcimer tab associated with that tune here:http://sniff.numachi.com/lookup.cgi?ds1 ... YTOP&tab=d