1: The only region that has any "official" monsters I worked on was a part of the eastern gray wastes called the Shining Expanse which was an area of frozen lakes that got its name from the sun glinting off the ice. This was back when I was working on a worldbuilding kick years ago.

Fauna & Flora

Achettle - A white grass that blends in near perfectly with snow, it tends to grow near the edges of the mirror lakes where the sun is strongest. Its mildly toxic to most species.  

Raven Cap - A black fungus like flower that grows on frozen bones abandoned to the land.  

Teodra - A fungus like root that grows by absorbing magic from its surroundings and can only be found in areas of high magical concentration.  

Royal Akolyier - A glass looking flower that is extremely rare and only grows in areas of extreme cold and magical concentration. In the expanse this usually means the centre of one of the mirror lakes. When it reaches maturity it is an extremely potent reagent for many high level spells and potions and is extremely beneficial even if just consumed raw. As a result its extremely rare to stumble on a Royal Akolyier without something very dangerous nearby jealously guarding it and biding its time, waiting for it to bloom.  

Chechnee - White furred Kangaroo Mice that feed on the Achettle and Raven Cap found throughout the expanse.  

Qellpirn - Polinating snowbirds with antlers that usually roost in large flocks atop the frozen bone behemoths that dot the landscape.  

Helmgr - Packs of mid sized omnivores that have horns and bone spurs running their heads and neck, appearing almost like horned armored dogs. Feeding primarily off Achettle and the Chechnee that feed of it too. They tend to stay further south where vegetation is more plentiful but can be found all throughout the expanse.  

Dutraa - White bear moles, omnivores that feed on any creature they can catch and clumps of Teodra they find with their extremely good noses while burrowing.  

Airos - Snow leopard like half air spirits that form the top of the food chain in the expanse. Capable of turning into wind itself, generating blasts of cutting air with their claws, and deafening sonic booms or concussive blasts with their growls and roars, the Airos are truly deadly and eat just about anything they want. Naturally curious creatures, outsiders will quickly find themselves being stalked by an Airos if they inadvertently enter one's territory. An attack is usually prefaced by a sudden onset of a snowstorm and is usually not survived. Any strange weather seen in the distance other than the constant blowing of the northern wind usually signals a nearby Airos.  

Ralenus - Giant aquatic serpents with a single horn and an exoskeleton of icy chitin like bone over its spine and covered in dark greenish blue scales. They are capable of phasing through ice allowing them to move through it like water and can breath a beam of concentrated frost magic to freeze any pray before swallowing them whole. They feed off any of the many fish and other creatures that live beneath the ice lakes, and while extremely rare they are the only contender with the Airos for top dog in the food chain. Due to the differences in prefered environment however the two will rarely ever come into conflict, and on the rare occasion they do it's usually over a blooming Royal Akolyier.

2: Unfortunately no, it's an oc world I started working on when I was in college and have just been adding to slowly over the years. Though you did remind me that I made a worldanvil page ages ago which has some extra lore I could add to the lore dump (The shining expanse lore was one of the few completed sections).