Question: The Messerschmitt 109TL was an alternative design proposed as a backup for a fighter version of a plane nicknamed what? 
Sentence (from "Focke-Wulf Fw 190"): The twin-row BMW 801 radial engine that powered most operational versions enabled the Fw 190 to lift larger loads than the Bf 109, allowing its use as a day fighter, fighter-bomber, ground-attack aircraft and, to a lesser degree, night fighter.
Relevant evidence: No