They're a beeeyotch to inject w/ anything if they're frozen (and they explode). Please thaw bird out first, do it away from any structures you don't want burned down, keep an eye on it, keep a class A/B extinguisher handy.
get a propane deep fryer. heat oil to 400 degrees F.
remove wrapper from fully frozen turkey.
drop turkey in fryer.
add lid.
walk away for 45 minutes.
come back, remove turkey, watch ravenous guests try to eat scalding hot turkey while cooking their throats.