Given that the "ja" means "snake" (acording to Pokebeach), I think it is safe to assume that Tsutaaja is based on a snake. Mind putting that in the page? --Deuxhero 00:54, 13 May 2010 (UTC)
The same post that told us these names on 2ch, said Tsutaaja is the くさへびポケモン (Grass Snake Pokémon).
Tsuta (蔦) means ivy and Ja is another reading for hebi (蛇), which means snake.--KurowaSan 01:02, 13 May 2010 (UTC)