Bigfoot is also known as Sasquatch in the Mirage Comics Monster Island issue. The bat creature was Vampire Succubor. The other monsters in additon to Jersey Red and Muhuru were Centaur, Sloth Monster (known as Lethargo in the book "The Legend of Yaotl), Spider Aracknor, Vampire Succubor, Sea Monster, Parrot Monster, and Crab Monster. (It almost sounds like leftover Sesame Street character names, doesn't it?) Two other monsters were unnamed and only briefly seen.
More information about the monsters are hereL
http://tmnt.wikia.com/wiki/Thirteen_Monsters