ted:
Where I can find similar info to compare totoid with rods ?
From the manufacturer of them. No one but them can say exactly what is in a given ferrite toroid or rod but the manufacturer.
You can get some idea if you have an LCR meter. Wind 10 turns on it, measure the inductance. Knowing that for a toroid, the inductance is proportional to the square of the number of turns, you now know how to calculate the number of turns to get a given inductance.
IMO, a joule thief is not a good choice for this. Who knows how efficient it will be? Likely not very efficient. There are chips custom made for this sort of thing.