Barroth spawns is swamps... everywhere... like you literally can't miss them

Anjanath spawns in forests

Jagras and great jagras spawn on beaches and forests

Nargacuga spawn in forests

Nergigante spawn in volcanic areas and monster\carnivore island

Tobi-Kadachi spawn in forests

Viper Tobi has a chance to spawn instead of normal tobi

Diablos can spawn in scorched mountains and desert areas

black diablos has a chance to spawn instead of normal diablos

Rajang spawns in Monster\Carnivore island

Pink rathi shares normal rathi spawns

Azure ratha shares normal ratha spawns

normal rathi rarely spawns in forests and mountains

normal Ratha rarely spawns in forests

Tigrex spawns on monster\Carnivore island, the deinonychus area in fjordur, the redwoods in fjordur, and in mountains

glavenus spawns on carnivore\monster island and the mountains of scorched

Legiana spawns in tundras... and are EVERYWHERE in rag, especially near the wyvern den

Zinogre spawns in forests

Odogaron spawns in forests

Stygian Zinogre has a chance to spawn instead of normal Zinogre

kirin rarely spawns in forests

Ebony Odogaron has a chance to spawn instead of normal odogaron

Jyratodus spawns EVERYWHERE the swamps

Beotodus spawn in ice tundras

Velkhana spawns in tundras

Kulu-Ya-Ku spawns forests and beaches

Dodogama spawns in mountains

Tzitzi-Ya-Ku spawns in forests

Brute Tigrex spawns in tundras

Mosswine spawns in forests, beaches, and swamps

Uragaan spawns on Monster Island

as for taming it's simple, just get the monsters below 20% health, the rest is a KO tame
and for anyone confused on what barroth eats... just use the awesome spyglass :\