So a couple things.
When you devour you do it all at once with no other actions or triggers resolving in between so in your situation you would choose to devour all 10 tokens and then Bloodspore Thrinax enters the field with 10 counters on it. At this point Reyhan, Last of the Abzan will trigger 10 times and you may move the counters onto any creature as you choose. Felisa only trigger on non-token creatures so she wouldn't trigger at all in this scenario. If you were to have devoured 10 non token creatures then Felisa would trigger 10 times and create tokens for each based on their counters at the same time that Reyhan triggered however because the tokens did not exist when Reyhan triggered you cannot place his counters on them.