Alternate reality
Teenax was the homeworld of the diminutive Teenaxi and their political body the Teenaxi Delegation.
In the alternate reality, the USS Enterprise visited Teenax in 2263 on a diplomatic mission on behalf of the Fibonans, bringing a fragment of an ancient weapon as a peace offering. (Star Trek Beyond)
The reference book Star Trek Beyond - The Makeup Artistry of Joel Harlow (p. 112) refers to this planet as "Teenaxia".