  We perform an in-depth analysis of the recently validated TOI-3884 system, an
M4 dwarf star with a transiting super-Neptune. Using high precision light
curves obtained with the 3.5 m Apache Point Observatory and radial velocity
observations with the Habitable-zone Planet Finder (HPF), we derive a planetary
mass of 32.6 +7.3 -7.4 Earth Masses and radius of 6.4 +/- 0.2 Earth Radii. We
detect a distinct star spot crossing event occurring just after ingress and
spanning half the transit for every transit. We determine this spot feature to
be wavelength-dependent with the amplitude and duration evolving slightly over
time. Best-fit star spot models show that TOI-3884b possesses a misaligned
($\lambda$ = 75 +\- 10 degrees) orbit which crosses a giant pole-spot. This
system presents a rare opportunity for studies into the nature of both a
misaligned super-Neptune and spot evolution on an active mid-M dwarf.
