Here is a list of teams and where to find rules for them.
Blood Bowl Teams
(For a list of the actual coaches and their teams playing in our season, please refer to this league's Tourplay website.)
All GW and NAF 'Official' Blood Bowl teams are allowed.
Nothing in life is balanced. Teams are officially organized by Tiers that represent the "easiest" teams to overall play (T1) to the absolute toughest (T3).
Tier 1
Amazons
Chaos Dwarves
Dark Elves
Dwarves
High Elves
Lizardmen
Norse
Orcs
Shambling undead
Skaven
Underworld
Wood Elves
Tier 2
Black Orcs
Chaos Chosen
Chaos Renegades
Elven Union
Humans
Imperial Nobility
Khorne
Necromantic Undead
Nurgle
Old World Alliance
Tomb Kings
Vampires
Slann
Tier 3
Goblins
Halflings
Ogres
Snotlings
Team Rules Locations
Teams from core rulebook
Teams from GW's Teams of Legend
https://www.warhammer-community.com/wp-content/uploads/2017/11/jsC3I47S92B7QwND.pdf
These are teams that are awaiting re-release, but their rules are already made for BB2020.
NAF "Official" Teams
https://www.thenaf.net/wp-content/uploads/2020/12/NAF-Rules-for-Tournaments-2021.pdf
These teams are intended for veteran coaches. They're definitely not easy to play. :)