OK, for reference, here is some information on these gods. I will try to get the very useful information from Monster Mythology posted over the weekend. Also, I will look through the Giantcraft book to see what we can make use of here.
Here is the information on these gods taken from Defenders of the Faith:
The Giant Deities
The deities of the giants are the offspring of Annam.
Annam
Annam is neutral. He is known as the Prime, the Progenitor of Worlds, and the Great Creator. He is both an all-knowing god of learning, philosophy, and deep meditation, and at the same time, a lustful, brash deity of fertility. The domains he is associated with are Knowledge, Magic, Plant, and Sun. His favored weapon is an unarmed strike.
Grolantor
The chaotic evil deity of hill giants, Grolantor, also has a ragtag following among ogres and ettins. He refuses any title but his given name. He is a god of hunting and combat whose willful stupidity gets him and his followers into more confrontations than they can handle. The domains he is associated with are Chaos, Death, Earth, and Evil. His favored weapon is the club.
Hiatea
The main goddess among the giant deities, Hiatea is neutral good. She is goddess of nature, agriculture, hunting, and childbirth, and is revered by many female giants, regardless of their alignment, for her heroism and prowess. The domains she is associated with are Animal, Good, Plant, and Sun. Her favored weapon is the spear.
Iallanis
Like her older sister Hiatea, Iallanis is neutral good. She is the goddess of love, forgiveness, mercy, and beauty, and seeks always to reunite the disparate giant races in harmony. The domains she is associated with are Good, Healing, Strength, and Sun. Her favored weapon is an unarmed strike.
Memnor
Memnor is subtle, charming, intelligent, cultured—and deeply, intensely (neutral) evil. He is a god of pride, mental prowess, and control, and his favored instruments in his schemes to usurp Annam are evil cloud giants. The domains he is associated with are Death, Evil, Knowledge, and Trickery. His favored weapon is the morningstar.
Skoraeus Stonebones
The god of the stone giants, Skoraeus is neutral. Called King of the Rock, he is a withdrawn deity who cares only for the affairs of stone giants. The domains he is associated with are Earth, Healing, Knowledge, and Protection. His favored weapon is the warhammer.
Stronmaus
Mighty Stronmaus is neutral good. He is called the Storm Lord, the Smiling God, and the Thunderhead. He rules over the sun, the sky, weather, and joy. The domains he is associated with are Chaos, Good, Protection, and War. His favored weapon is the warhammer. He is a sworn enemy of Memnor.
And here is the information on Grolantor and Skoraeus from the original Dieties and Demigods (minus stats):
GIANTS, Hill
GROLANTOR
Lesser god
ALIGNMENT: Chaotic evil
WORSHIPER'S ALIGN: Chaotic evil (hill giants)
SYMBOL: Wooden club
PLANE: Tarterus
Grolantor appears to be a huge and powerful hill giant. He wields a huge club named Dwarfcrusher that hits for 4-40 points of damage, and he usually wears several belts of woven dwarfbeards.
Grolantor's creed is persecution of all inferior races (i.e. all those smaller than hill giants). Hill giant shamans will refuse to admit that other giants are actually larger than they, preferring to think of them as equals. Hill giant shamans range up to the 7th level of clerical ability.
Ettins also worship Grolantor, though in a slightly different (two-headed) aspect. However, this does not necessarily make them friendly toward hill giants. Despite (or perhaps because of) their two heads, ettins are less wise than giants, and cannot become greater than 3rd level shamans.
GIANTS, Stone
SKORAEUS STONEBONES "King of the Rock"
Lesser god
ALIGNMENT: Neutral
WORSHIPER'S ALIGN: Neutral (stone giants)
SYMBOL: Stalactite
PLANE: Prime Material Plane
Skoraeus is the Living Rock, a huge granite humanoid who lies at the heart of the world. He knows everything that happens in areas touching rock by listening to the vibrations that are carried to him.
Stonebones will never venture above ground, and he cannot even be gated there. While touching raw stone, he regenerates 5 hit points per round. He can strike with his fists for 6-60 points of damage each. Skoraeus can cast one earthquake spell per round, at the 30th level of ability. He can also instantly summon 2-20 stone giants to his aid.
Stone giant shamans cultivate an attitude of indifference and aloofness. It is their belief that the doings of lesser mortals should have little influence upon the affairs of stone giants. They regard both law and chaos with suspicion, and are inclined to repulse the overtures of either. Stone giant shamans can attain the 7th level of clerical ability.