Can you change the way the the grenade looks? not like reskining but like say I wanted to make it into a present could I do it?
Yes; it would involve giving it a new msh and skin to match.
I've seen it done before; Napseeker replaced the grenade with a barrel in one of his mods.
look in the grenade weapon odf for the side it has a reference to this
geometryname = "com_weap_inf_grenadethermal"
and that calls on the com_weap_inf_grenadethermal.msh in common.lvl you can change it to whatever mesh you want and it will load it from the side.lvl so if you had present.msh it would replace the thermal like this
geometryname = "present"