The phrase everyone is looking for is "Power Back". "Back Taxi" is when you taxi down a runway in the direction that is opposite for takeoff and landing.
Modern turboprops will power back, so will jet aircraft with the thrust reverser buckets deployed. It's frowned upon for two reasons: One, you can't see where you're going and two, (especially with the jet) you blow up all kinds of FOD and debris and it ends up getting ingested into the engine. Oh, and three if you are backing up with a tricycle gear aircraft and tap the brakes even a little too hard you are going to end up sitting on your tail! (Which means you will then be sitting on your own tail while the investigation is being done!)
As for the B-29, I don't know of any recip engines that feature reverse pitch but I don't know everything and am not familiar enough with the later model radials and transports. Goose says he's seen a C-119 do it and he has no reason to lie. JF in MI says those particular planes had a special prop controller which is logical for their use and no doubt there's historical data to back it up.
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