Where can I find lore about the Shadow of Ao

Canonfire! has a good Bullywug article with an extensive bibliography that should list all the early-D&D sources of info on bullywugs.

More recently, Pathfinder has renamed the bullywug the "boggard" due to IP concerns and has used them extensively, see this wiki article and its references but especially the "Ecology of the Boggard" in the Kingmaker adventure path. All this information has the virtue of being in print and easily obtainable, though any crunch will be 3.5 compatible and not 4e compatible.

All mentions, that I am aware of, regarding Bladesingers are below:

• AD&D 2^nd Edition / Complete Book of Elves

  Distinctive Appearance. Not only are they easily identifiable by their weapon of choice and catlike grace, Bladesingers are decorated with their weapon guild's distinctive tattoo. Each guild has a separate and unique tattoo depicting its style of weapon through an animal representation. Long swords are often represented by great cats such as lions or panthers, a whip would be shown as a striking snake, and so forth.

• AD&D 2^nd Edition / Elves of Evermeet

  On Evermeet they are organized into small warrior lodges, each specializing in a different weapon. They often tattoo themselves with old runes, and each lodge has a special symbol it's members tattoo themselves with to identify their membership.

Bladesingers are mentioned in the edition after AD&D 2^nd Edition, and despite its contradiction to 'guilds' or 'schools' there is no mention of any particular weapon (besides blades) to be in use.

• D&D 3^rd Edition / Races of Faerun

  Most bladesingers work alone, sufficient unto themselves, but in larger communities they sometimes have the opportunity to fight together in the same combat. Bladesingers are normally trained singly by another bladesinger, and the concept of anything as formalized as a bladesinger school is an absurd notion to them.

What that means, in that edition, is a school representing animals went to the way side. in the revised edition, D&D 3.5 Edition, Bladesingers were mentioned as well.

• D&D 3.5 Edition / Complete Warrior

  Bladesingers are elves who have blended art, swordplay, and arcane magic into a harmonious whole.

It is essentially a copy paste, with a lot omitted, from Races of Faerun. Only "swordplay" and "any martial weapon" is mentioned. Nothing about schools guilds at all. There is another book the Bladesinger is mentioned, but its essentially only a blurb.

• D&D 3.5 Edition / Races of the Wild

  Bladesinger (Complete Warrior): Practitioner of the quintessential elven martial art, the bladesinger is both a skilled mage and a deadly swordmaster.

Once again, only sword is mentioned; probably due to racial sword proficiency - and the implication of blade in the name Bladesinger. Eventually, near the end of this edition, Bladesingers became Duskblades, and lost its 'elf-only' motif.

• D&D 3.5 Edition / Player's Handbook II

  While the ability to cast arcane spells in armor originated with the elves, over the millennia the secrets of the duskblade have been disseminated to the other races, and today members of any race can become a duskblade.

No mention of guilds or schools, or even preferred weapons were mentioned. Any martial weapon it appeared to be - but spending a feat to use a whip...most people would say, "no thank you." Bladesingers were included in the edition after this one, much to my surprise. But, it discredits the 'different weapons' aspect entirely.

• D&D 4^th Edition / Neverwinter Campaign Guide

  Benefit: Choose a one-handed melee weapon with which you have proficiency, and that is a light blade or a heavy blade.

Now we come to D&D 5^th Edition, and you already have the published information on them thus far. Since, to my knowledge, that edition is to harken back to the days of simpler game-play and more intrinsic role-play; rather than the vice versa, take this opportunity to "Create Your Own" schools, guilds, and organizations.