Tree Stump

<recipetype:stone_age:tree_stump>.addRecipe(String name, IItemStack output, IIngredient tool, IIngredient input, int chopTimes, @OptionalString String group)

<recipetype:stone_age:tree_stump>.addRecipe("oak_planks", <item:minecraft:oak_planks>, <item:minecraft:iron_axe>, <item:minecraft:oak_log>, 2);
TreeStumpManager.INSTANCE.addRecipe("oak_planks", <item:minecraft:oak_planks>, <item:minecraft:iron_axe>, <item:minecraft:oak_log>, 2);