It might be required for you to import the package if you encounter any issues (like casting an Array), so better be safe than sorry and add the import at the very top of the file.

ZenScript
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import crafttweaker.api.entity.type.projectile.SmallFireball;

SmallFireball extends Fireball. That means all methods available in Fireball are also available in SmallFireball

ZenScript
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new SmallFireball(level as invalid, shooter as LivingEntity, xPower as double, yPower as double, zPower as double) as SmallFireball
new SmallFireball(level, shooter, 0, 1, 2);

Параметр	Тип	Описание
Параметр level	Тип invalid	Описание The level this entity is in.
Параметр shooter	Тип LivingEntity	Описание The entity that created the fireball, used to get the position.
Параметр xPower	Тип double	Описание The x power of the entity.
Параметр yPower	Тип double	Описание The y power of the entity.
Параметр zPower	Тип double	Описание The z power of the entity.

ZenScript
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new SmallFireball(level as invalid, x as double, y as double, z as double, xPower as double, yPower as double, zPower as double) as SmallFireball
new SmallFireball(level, 0, 1, 2, 3, 3, 3);

Параметр	Тип	Описание
Параметр level	Тип invalid	Описание The level this entity is in.
Параметр x	Тип double	Описание The x position of the entity.
Параметр y	Тип double	Описание The y position of the entity.
Параметр z	Тип double	Описание The z position of the entity.
Параметр xPower	Тип double	Описание The x power of the entity.
Параметр yPower	Тип double	Описание The y power of the entity.
Параметр zPower	Тип double	Описание The z power of the entity.