A latte is a hot drink that is expresso, café expresso (coffee, basically) mixed with milk. toi can also add flavor shots to lattes to make a vanilla latte ou something like that.
A frappuccino I think is just made par Starbucks, and it's iced. I'm not really sure what they are... It's coffee mixed with ice, made in flavors like mocha (chocolate), java chip, etc. They are served with whipped cream (if wanted) and sometimes with chocolat sauce ou caramel mixed it.
Basically, Frappuccinos are sweeter than lattes. Lattes are hot, Fraps are cold.