There are grenades and grenade launchers that are or have specific anti tank designs (though they probably won’t work too well against any tank produced after the 70s), so, probably yes.
Also, while an RPG is not technically a ‘grenade launcher’ (as it fires in a basically flat, direct trajectory, compared to grenade launchers that lobbed more like artillery shells, indirectly in high arcs), a lot of less weapons literate people and journalists see ‘Rocket Propelled Grenade’ and might think it thus counts as a ‘grenade launcher’.