  We present the results of a search for deeply-eclipsing white dwarfs in the
ZTF Data Release 4. We identify nine deeply-eclipsing white dwarf candidates,
four of which we followed up with high-cadence photometry and spectroscopy.
Three of these systems show total eclipses in the ZTF data and our follow-up
APO 3.5-meter telescope observations. Even though the eclipse duration is
consistent with sub-stellar companions, our analysis shows that all four
systems contain a white dwarf with low-mass stellar companions of ~0.1 Msol. We
provide mass and radius constraints for both stars in each system based on our
photometric and spectroscopic fitting. Finally, we present a list of 41
additional eclipsing WD+M candidates identified in a preliminary search of ZTF
DR7, including 12 previously studied systems. We identify two new candidate
short-period, eclipsing, white dwarf-brown dwarf binaries within our sample of
41 WD+M candidates based on PanSTARRS colors.
