Only speed and wavelength will change.
Frequency will not change because at the boundary/interface of the medium, the number of waves you send
is the number of waves you receive, at the other side, almost
instantly. Frequency doesn't change because it depends on travelling of
waves across the interface.
But speed and wavelength change as the material on the other side may
be different, so now it might have a longer/shorter size of wave and so
the number of waves per unit time changes.