It doesn't hold grudges. It runs them down and impales them.

Charging Tuskodon

Trample
If Charging Tuskodon would deal combat damage to a player, it deals double that damage to that player instead.

The List

Rivals of Ixalan

If Charging Tuskodon has trample damage to assign to a player, that damage is assigned based on its actual power and is doubled only as it’s dealt. For example, if Charging Tuskodon is blocked by a 3/3 creature, the attacking player can assign 1 damage to the defending player and then Charging Tuskodon deals 2 damage to that player.

The doubled damage Charging Tuskodon deals is still combat damage.