  Object of study in the present paper are slant and Legendre null curves in
3-dimensional Sasaki-like almost contact B-metric manifolds. For the examined
curves we express the general Frenet frame and the Frenet frame for which the
original parameter is distinguished, as well as the corresponding curvatures,
in terms of the structure on the manifold. We prove that the curvatures of a
framed null slant and Legendre curve are constants if and only if a specific
function for the considered manifolds is a constant. We find a necessary and
sufficient condition a slant null curve to be a generalized helix and a
Legendre null curve to be a null cubic. For some of investigated curves we show
that they are non-null slant or Legendre curves with respect to the associated
B-metric on the manifold. We give examples of the examined curves. Some of them
are constructed in a 3-dimensional Lie group as Sasaki-like manifold and their
matrix representation is obtained.
