Nanofluids have grasped the attention of numerous researchers due to their enhanced thermal properties and heat transport performance. Recently, the mixture of ternary nanoparticles is exploited to synthesize a unique nanofluid that has superior thermal features. In this regard, the effects of internal heat generation, thermal radiation, and convection on a steady heat transfer mechanism in a trapezoidal fin wetted with ternary hybrid nanofluid are scrutinized in this investigation. Additionally, this research explores the comparative assessment of thermal and heat energy variations in both dry and wet conditions. The non-dimensional transformations result in the governing differential equation and boundary conditions being reduced to dimensionless expressions of an ordinary differential equation (ODE). A numerical method Runge-Kutta-Fehlberg's fourth-fifth is employed to solve the yielded differential equation of temperature. In addition, the effects of pertinent thermal variables on the thermal profile of the fin are explored graphically. The outcomes reveal that improving the surface radiation variable lowers the thermal profile, and the same behavior is detected for the surface convection parameter. Furthermore, the fluids comprising ternary nanoparticles have the greatest thermal variation. Also, the longitudinal trapezoidal fin has the optimum performance, and higher heat transfer characteristics compared to the typical straight fin.