No, I'm pretty sure Spock just arms them.
(I'm not sure it's stated how, but I'd assume he deduces how to do so from the information gleaned from Carol Marcus' having disarmed one of them. Although she just did that by yanking on something... so how that would work... uh, please don't ask me to make STiD plot points make sense.
Maybe you'll see something on your rewatch.)
In fact it would make Marcus' character arc extremely bizarre -- moreso -- if they weren't explosive to begin with, since presumably he
was able to check the torpedoes before he had them loaded on the Enterprise and his plan seems to revolve around getting the Enterprise to blow stuff up on Kronos and start a war.