If you have a troop with the condition inflicted on it, you can click on the troop and see what the status does.
Freezing, prevents extra turns from the frozen unit, or from match 4+ using the same color as the unit. If the front unit is frozen, it will prevent extra turns from 4+ skull matches.
Disease reduces the mana a diseased troop gains from matches. I’m not yet clear by how much, perhaps someone else will know.
@MrSammy started a Wiki. It’s still a pretty new resource so its being filled in as he can.
: GoW WIKI - Here!