In MCInfected 2.0 Human "Survivors" have access to certain grenades that they can use to combat the infected. If you have Demo then you get 1 additional grenade from that list. However with Demo pro you receive 2 additional grenades with the ones you already possess. In addition, Infected can also gain grenades from ZDemo which gives you any grenade except the Cleanse Grenade. If you have the Perk Scav Pro then you have a small chance to also scavenge random grenades as infected.
The following grenades can be found in game with your rank determining which ones you will receive in game.