Man pages matching name xmvacreatemanagedtogglebuttongadget in section 3:

XmVaCreateManagedToggleButtonGadget.3.en	debian 10 / libmotif-dev
XmVaCreateManagedToggleButtonGadget.3.en	debian 11 / libmotif-dev
XmVaCreateManagedToggleButtonGadget.3.en	debian 12 / libmotif-dev