No. Unless it's a glitch, the only way you can spawn them other then mods or console is going into the NPCs section and manually spawning a zombie.
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Garry's Mod doesn't have its own sound effects and stuff, so you have to add them. I've been trying to find a way how to add my own sound effects to Garry's Mod, but I haven't found out a way yet.
well theres cliff mod rocket mod fishy mod night blood gultch mod jerrassic park mod sniper mod no gun mod spiner mod bumper cars elite mod pelican mod echo 116 and more i dont know because you can make your own mods
No, as long as it is not a mod and its your own idea it is not
depending on the mod you want For like players or a map you can download it at fpsbanana.com and you can get if from them. If you want like zombie mod for custom match you cant play that with bots you have to have your own online server and have to modify it your self.
You can go multi player and look up zombie mod servers all of them have the zm_(mapname) maps so you can search by zombie in server name or zm_ in server map. Unless you have your own server that you run you cannot play zombie mod with bots.