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:
Bladesingers are mentioned in the edition after AD&D 2nd Edition, and despite its contradiction to 'guilds' or 'schools' there is no mention of any particular weapon (besides blades) to be in use.
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.
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.
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.
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.
Now we come to D&D 5th 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.
Best Answer
Most of the same skin tones of real life modern humans appear in major D&D settings.
D&D 5e Player's Handbook p.29 says:
Pages 30-31 describes nine ethnic groups of the Forgotten Realms, whose skin tones are variously described as dusky brown, tawny, fair, amber, yellowish-bronze, and dark mahogany.
The Sword Coast Adventurer's Guide, p.110-112, adds descriptors of tan, dark, olive, pale, tanned, bronze, and golden. This seems to cover most of the possible values of real-world modern humans.
The peoples of the World of Greyhawk are described in the D&D 3e Living Greyhawk Gazetteer as variously having golden, bronze, tan to olive, rich red-brown or dark brown, and fair. The Suel in particular have a higher than average rate of albino people.
I faintly recall Eberron's creator suggesting that humans born in unusual circumstances, such as during a planar confluence, might be born with rare skin tones, such as green or blue. However, I don't believe this was a canon article, and the official Eberron books tend to gloss over details of human skin tone.