I’m pretty sure I posted about this in the old pen & paper games forum. Brick Monsters is a line of Lego brick built monsters. It includes build instructions, monster stats for 3.5 and 5e, and digital Lego files (mpd). With the mpd you can import them into some brick seller sites to purchase the pieces. Each monster has two builds because I like to make things more difficult for myself. I just released the phantom fungus. The otyugh is pay what you want if you want to check it out for free.
If you have specific monsters you would like in Lego form let me know.