  In this work, we present a new type of scalar clouds supported by spherically
symmetric horizonless compact objects in the scalar-Gauss-Bonnet theory. Unlike
the previous spontaneous scalarization that is triggered by the tachyonic
instability, our scalarization arises from a nonlinear instability that is
non-spontaneous. We explore two types of boundary conditions for the scalar
field at the surface of the compact objects and find an infinite countable set
of scalar clouds characterized by the number of nodes for both cases. Our study
demonstrates that boundary conditions have a significant impact on the
formation of scalar clouds. Specifically, for the Dirichlet boundary condition,
scalarization is more likely to occur for compact objects with medium radii and
becomes harder for ultra-compact and large ones. Conversely, for the Robin
boundary condition, scalarization is easier for more compact objects.
