Tok'ra Kree!

Any show, anyone, any Tok'ra, a Tok'ra ship crashed on Earth centuries ago, and it turns out those onboard survived. What happened to them? Did they get new hosts as the years passed? Did they stick themselves in stasis jars? Die somewhere in secret? Who were they? Perhaps they had found a daughter of Egeria and she and several other Tok'ra are alive and in hiding on Earth and have not heard of the Stargate program. How do the SGC find out about them? Or are they approached by the Tok'ra?