Indeed the Murata CMWX1ZZABZ-078 module contains a TCXO according to specs.
However the datasheet doesn’t list the deep-sleep / hibernate current which is peculiar for a device targeted at low power applications.
This blog article also mentions a module containing a TCXO and explicitly mentions the high sleep current of 600 uA making it unsuitable for low power / battery operated devices when powered continuously.
Sigfox modules are also using TCXO I understand, however they are cheap and low power. As far as I understand they may have an external TCXO and probably switch off power to it. Eg, see the AX-SFEU example, note the Vtcxo at the power mode control block.
Beware: I’m not an expert nor do I have experience with these modules yet, just doing some googling .