If you had a nightmare like this, it could represent your father or some other figure of masculine authority, such as a demanding teacher. On the other hand, a dream giant may represent spiritual or physical power. A giant among men in your dream may be a guide who comes to give you spiritual insight.
Not all giants are ogres, and maybe you dreamed of being rescued from the ogre’s clutches by a gentle giant, perhaps another influential figure in your life who you respect for their moral courage. Any towering presence in your dreams tends to represent either something that poses a problem to you, or someone whose power makes you feel protected, or small and helpless.