Man pages matching name xmvacreatetogglebuttongadget in section 3:

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