Are there legos in Japan?

pretty obvi.

Yes.

Well they have a legoland in Nagoya - so I'll let you decide based on that....

https://www.legoland.jp/en/

There is absolutely a lot of legos in Japan. As a matter of fact, you can find legos anywhere you go. What's interesting is that the legos in Japan are cuter compared to the ones that are sold abroad. Just be careful not to buy the ones that are too expensive because there are a lot of legos offered at a reasonable price if you just look around. I also think that there are a lot of legos available on Japanese sites. However, it can be more expensive because of the shipping fee.