In terms of mass generation in the strong interaction without chiral symmetry breaking, we perform the first study for light scalar-quarks $\ensuremath{\phi}$ (colored scalar particles with ${\mathbf{3}}_{c}$ or idealized diquarks) and their color-singlet hadronic states using quenched $\mathrm{SU}(3{)}_{c}$ lattice QCD with $\ensuremath{\beta}=5.70$ (i.e., $a\ensuremath{\simeq}0.18\text{ }\text{ }\mathrm{fm}$) and lattice size ${16}^{3}\ifmmode\times\else\texttimes\fi{}32$. We investigate ``scalar-quark mesons'' ${\ensuremath{\phi}}^{\ifmmode\dagger\else\textdagger\fi{}}\ensuremath{\phi}$ and ``scalar-quark baryons'' $\ensuremath{\phi}\ensuremath{\phi}\ensuremath{\phi}$ as the bound states of scalar-quarks $\ensuremath{\phi}$. We also investigate the color-singlet bound states of scalar-quarks $\ensuremath{\phi}$ and quarks $\ensuremath{\psi}$, i.e., ${\ensuremath{\phi}}^{\ifmmode\dagger\else\textdagger\fi{}}\ensuremath{\psi}$, $\ensuremath{\psi}\ensuremath{\psi}\ensuremath{\phi}$, and $\ensuremath{\phi}\ensuremath{\phi}\ensuremath{\psi}$, which we name ``chimera hadrons.'' All the new-type hadrons including $\ensuremath{\phi}$ are found to have a large mass even for zero bare scalar-quark mass ${m}_{\ensuremath{\phi}}=0$ at ${a}^{\ensuremath{-}1}\ensuremath{\simeq}1\text{ }\text{ }\mathrm{GeV}$. We find a ``constituent scalar-quark/quark picture'' for both scalar-quark hadrons and chimera hadrons. Namely, the mass of the new-type hadron composed of $m$ $\ensuremath{\phi}$'s and $n$ $\ensuremath{\psi}$'s, ${M}_{m\ensuremath{\phi}+n\ensuremath{\psi}}$, approximately satisfies ${M}_{m\ensuremath{\phi}+n\ensuremath{\psi}}\ensuremath{\simeq}m{M}_{\ensuremath{\phi}}+n{M}_{\ensuremath{\psi}}$, where ${M}_{\ensuremath{\phi}}$ and ${M}_{\ensuremath{\psi}}$ are the constituent scalar-quark and quark masses, respectively. We estimate the constituent scalar-quark mass ${M}_{\ensuremath{\phi}}$ for ${m}_{\ensuremath{\phi}}=0$ at ${a}^{\ensuremath{-}1}\ensuremath{\simeq}1\text{ }\text{ }\mathrm{GeV}$ as ${M}_{\ensuremath{\phi}}\ensuremath{\simeq}1.5--1.6\text{ }\text{ }\mathrm{GeV}$, which is much larger than the constituent quark mass ${M}_{\ensuremath{\psi}}\ensuremath{\simeq}400\text{ }\text{ }\mathrm{MeV}$ in the chiral limit. Thus, scalar quarks acquire a large mass due to large quantum corrections by gluons in the systems including scalar quarks. Together with other evidences of mass generation of glueballs and charmonia, we conjecture that all colored particles generally acquire a large effective mass due to dressed gluon effects. In addition, the large mass generation of pointlike colored scalar particles indicates that plausible diquarks used in effective hadron models cannot be described as the pointlike particles and should have a much larger size than $a\ensuremath{\simeq}0.2\text{ }\text{ }\mathrm{fm}$.