>>112380614If Zuko can get within fist-fighting distance, then he has a shot because Todoroki has no brawling skills and isn't very strong physically.
That said, Deku who had actual superstrength and speed couldn't make that plan work, so Zuko doesn't have great odds of doing the same. In all likelihood Todo just icewalls Zuko out of the fight, and Zuko can't spam enough fire to counter that amount of ice.