There are works using slime mold as logic gates. But i do not think any work has gotten past that to make a full on computer.

https://www.sciencedaily.com/releases/2014/03/140327100335.h...

https://www.sciencedirect.com/science/article/pii/S136970211...

edit: it is also used as a sensor:

https://techxplore.com/news/2022-12-scientists-smartwatch-po...