  Higher-order topological superconductors and superfluids have triggered a
great deal of interest in recent years. While Majorana corner or hinge states
have been studied intensively, whether superconductors and superfluids, being
topological or trivial, host higher-order topological Bogoliubov excitations
remains elusive. In this work, we propose that Bogoliubov corner excitations
can be driven from a trivial conventional $s$-wave superfluid through
mirror-symmetric local potentials. The topological Bogoliubov excited modes
originate from the nontrivial Bogoliubov excitation bands. These modes are
protected by mirror symmetry and robust against mirror-symmetric perturbations
as long as the Bogoliubov energy gap remains open. Our work provides new
insight into higher-order topological excitation states in superfluids and
superconductors.
