The Transport Node Profile is created by VCF on the NSX-T Manager during cluster creation and then detached once the cluster is created successfully.
During cluster expansion this same TNP is re-used. If it is renamed then the cluster expansion workflow will fail.
VCF expects the format to be <ClusterName>-<Random UUID> and the description to be vCenter FQDN.
VMware Cloud Foundation
Renaming of the Transport Node Profile (TNP) created by SDDC manager is not supported.
Please refer to the following KB article for allowed rename operations in Vmware Cloud Foundation:
Renaming VCF SDDC manager objects