Two points into Frozen fang, and it’s doing the same damage as normal attacks (factoring in the damage range). E.g. compare the two normal (non crit) below, if it was truly a 100% more multiplier this would never happen. No buffs were used for the screenshots, just a single wolf attacking the dummy, and the damage numbers are consistent over time (e.g. crits do ~2.5k for both normal and frozen fang)
Skill tree:
Stats looks like this, but I definitely didn’t stack a bunch of minion % phys dmg or % melee phys