  We compute the Quasi-Normal Mode (QNM) frequencies for scalar perturbations
for modified Schwarzschild black holes in Loop Quantum Gravity. We study the
singularity-free polymerized metric characterised by two parameters encoding
loop quantum effects: the minimal area gap $a_0$ and the polymeric deformation
parameter $P$. We perform numerical computations using Leaver's continued
fraction method and compare our results to other semi-analytical methods and
existing literature. We study the effects on the QNM spectrum of variation of
both deformation parameters and systematically compare to the standard
Schwarzschild case. In particular we find that the scalar fundamental mode is
modified from the third decimal for values of $P$ in accordance with the most
recent astrophysical constraints. We also show that qualitative differences
arise for highly damped modes: on the one hand, a new crossing of the imaginary
axis occurs for high values of $a_0$ and, on the other hand, increasing $P$
produces a positive shift of the real part and an increase of the spacing in
imaginary part between modes.
