  We study the focusing mass-subcritical biharmonic nonlinear Schr\"odinger
equation (BNLS) on the product space $\mathbb{R}_x^d\times\mathbb{T}_y^n$.
Following the crucial scaling arguments introduced in \cite{TTVproduct2014} we
establish existence and stability results for the normalized ground states of
BNLS. Moreover, in the case where lower order dispersion is absent, we prove
the existence of a critical mass number $c_0\in(0,\infty)$ that sharply
determines the $y$-dependence of the deduced ground states. In the mixed
dispersion case, we encounter a major challenge as the BNLS is no longer
scale-invariant and the arguments from \cite{TTVproduct2014} for determining
the sharp $y$-dependence of the ground states fail. The main novelty of the
present paper is to address this difficult and interesting issue: Using a
different scaling argument, we show that $y$-independence of ground states with
small mass still holds in the case $\beta>0$ and $\alpha\in(0,4/(d+n))$.
Additionally, we also prove that ground states with sufficiently large mass
must possess non-trivial $y$-dependence by appealing to some novel construction
of test functions. The latter particularly holds for all parameters lying in
the full mass-subcritical regime.
