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Recent studies on different topological materials in condensed matter physicshave provided the evidence of topological nature for bosonic particle likephonons by performing various theoretical calculations and experimentalobservations. Here, the topological behaviours of phonons of SnS, SnSe and SnTematerials in rock-salt structure are investigated using $ab$-$initio$methodology. For all these materials, the tilted linear band touching isobserved along with the presence of band inversion in direction X-W. Thetopological point in phonon dispersion curve along X-W direction is found to be$\sim$2.83, $\sim$2.46 and $\sim$2.51 THz for SnS, SnSe and SnTe, respectively.The calculated numbers of Weyl points (WPs) is estimated to be 56, 24 and 54for SnS, SnSe and SnTe, respectively. These WPs have shown conserved Chiralcharges for all corresponding materials. The surface local density of states iscomputed for these compounds, where the surface arc is clearly seen. In case ofSnS, the surface arc is found at 2.0 - 2.2 THz energy region. Also, theisofrequency surface states are investigated to observe the presence of Fermiarc for SnX (X = S, Se, Te). The present first-principles calculation predictsthat SnS, SnSe and SnTe show type-II Weyl phononic behaviour along withevidence of topological phononic surface states.

First-principles evidence of type-II Weyl phonons in rock-salt Tin Chalcogenides (SnS, SnSe & SnTe) materials