I found them.
Give someone credit for these, although I'm not quite sure who;
Stegosaurus
Huge Beast
Hit Dice: 18d10+108 (207 hp)
Initiative: -1 (Dex)
Speed: 20'
AC: 15 (-2 size, -1 Dex, +8 natural)
Attacks: Tail spikes +16 melee, slam +11 melee
Damage: Tail spikes 3d6+5, slam 2d6+2
Face/Reach: 10'x20'/10'
Special Qualities: Scent
Saves: Fort +17, Ref +10, Will +7
Abilities: Str 20, Dex 9, Con 23, Int 1, Wis 12, Cha 7
Skills: Listen +9, Spot +9
Climate/Terrain: Warm forest, hill, and plains
Organization: Solitary, pair, or herd (5-8)
Challenge Rating: 8
Treasure: None
Alignment: Always neutral
Advancement: 19-35 HD (Gargantuan), 36-48 HD (Colossal)
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*A stegosaurus prefers to use its spiked tail in combat, but can only use it against opponents near its rear end. It can bodyslam opponents in any location, however.
Diplodocus
[Can also be used to represent any sauropod]
Gargantuan Beast
Hit Dice: 24d10+168 (300 hp)
Initiative: -1 (Dex)
Speed: 20'
AC: 14 (-4 size, -1 Dex, +9 natural)
Attacks: Tail slap +26 melee
Damage: Tail slap 2d8+18
Face/Reach: 20'x80'/15'
Special Attacks: Trample 3d10+12
Special Qualities: Scent
Saves: Fort +21, Ref +13, Will +9
Abilities: Str 35, Dex 8, Con 25, Int 1, Wis 12, Cha 9
Skills: Listen +6, Spot +6
Climate/Terrain: Warm forest, hill, and plains
Organization: Solitary, pair, or herd (3-10)
Challenge Rating: 15
Treasure: None
Alignment: Always neutral
Advancement: 25-30 HD (Gargantuan) 31-45 HD (Colossal)
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Trample (Ex): A diplodocus can trample Large or smaller opponents for 3d10+12 points of damage. Opponents who do not make attacks of opportunity against the diplodocus can attempt a Reflex save (DC 34) for half damage.
Lambeosaurus
[Can be used for any duck-billed dinosaur or other large, bipedal herbivore (such as the Iguandoon above).]
Huge Beast
Hit Dice: 12d10+48 (114 hp)
Initiative: +0
Speed: 30'
AC: 14 (-2 size, +6 natural)
Attacks: Tail slap +12 melee
Damage: Tail slap 2d6+7
Face/Reach: 10'x20'/10'
Special Qualities: Scent
Saves: Fort +12, Ref +8, Will +6
Abilities: Str 20, Dex 10, Con 19, Int 1, Wis 15,
Skills: Listen +8, Spot +8
Feats: Alertness
Climate/Terrain: Warm forest, hill, and plains
Organization: Solitary, pair, or herd (5-16)
Challenge Rating: 5
Treasure: None
Alignment: Always neutral
Advancement: 13-20 HD (Huge), 21-32 HD (Gargantuan)
Iguanodon
As Lambeosaurus (see below) with the following changes:
Attacks: 2 claws +12 melee, tail slap +7 melee
Damage: Claw 1d3+5, tail slap 2d6+2
I found them on my computer. I think I got them off of a PDF I downloaded. I don't remember though
But don't let me from making your versions of them anyway.