GypsyComet said:
Having dug up my old Cardboard Heroes, I'm now looking for D20 stats for what appears to be an octopus, but a landwalking, weapon-using, armor-wearing octopus...
Uh- now that is strange as hell.
Easiest way to do it is to take the Octopus (or Giant Octopus) stats in the MM and modify the stats. I'll use the Octopus as an example:
Speed: 30 ft. [drop the land speed and make the Swim speed its land speed]
Attacks: "; or 6 weapons +5 melee" [add to the end of the octopus entry]
Damage: "; or weapon 1d8+1" [add to the end of the entry; assumes longswords for damage, though you could use any weapon]
Feats: Allow weapon finesse to affect its weapons as well. Also give it the Multidexterity and Multiweapon Fighting feats as bonus feats (like the Marilith has listed in its entry).
For its AC, just tack on whatever armor you deem appropriate.
Give the monster a new name and there ya go.
That's the easy way. Another way (and perhaps the best, as it makes a little more sense)
Use the Octopus/Giant Octopus as a base, change it to a Beast, rework its HD, saves, and stuff for the Beast entry.
Give it the "6 weapon attacks" listed above and bonus feats. And there ya go.
If ya want, I can whip up the stats (using the second example) for ya.