The Frozen Lumberjack is one of the different variants of Zombies. It is only found in the snow biome. This lumberjack got lost in the woods when the apocalypse began, only to be found days later now as an undead monster whose corpse is not too decomposed because of the freezing cold in the snow forest. It appears to be the snow equal to the Bloated Walker as it has slightly more health than the average zombie.
Very much like the Bloated Walker, this zombie is is slightly slower than other running zombies during the night. If retreating should be considered for any reasons and is possible, clearing out faster zombies and leaving this type of zombie alive can be a good strategy.
The Frozen Lumberjack, Frigid Hunter and Frostbitten Worker all seem to share similar traits when it comes to health. As of Alpha 6, all snow zombies appeared to have the same amount of health as a Bloated Walker, requiring 2 pistol headshots to bring them down. This may become a rising problem ammunition-wise. Nevertheless, the Frozen Lumberjack retains the slightly lower running speed during the night when compared to the other snow biome zombies.
If it is imperative to face any snow biome, consider using other weapons if possible to one-hit them with headshots.