  We propose a realization of mass varying neutrino dark energy in two
extensions of the Standard Model (SM) with a dynamical neutrino mass related to
the acceleron field while satisfying the naturalness. In the first scenario the
SM is extended to include a TeV scale scalar Higgs triplet ($\xi$) and a TeV
scale second Higgs doublet ($\eta$), while in the second scenario an extension
of the SM with fermion triplet $(\Sigma)$ is considered. We also point out the
possible leptogenesis mechanisms for simultaneously generating the observed
baryon asymmetry of the universe in both the scenarios and discuss the collider
signatures for the TeV scale new fields which make these models testable in the
current run of LHC.
