Melt 1/4 cup of butter in a large skillet over medium heat. Saute green onions and garlic in butter until tender. Remove from pan and set aside. In the same skillet, melt 1/2 cup of butter and saute the crawfish for 5 minutes; set aside.
In a large pot over medium heat, combine potato soup, mushroom soup, corn and cream cheese. Mix well, and bring to a slow boil. Stir in half-and-half, sauteed green onions and crawfish. Season with pepper and adjust with salt, if necessary. Bring to a low boil, and simmer 5 minutes to blend flavors.