According to my research, the first case of assault with a frozen turkey occurred in the 1940s. But by the end of the 20th Century, the use of frozen turkeys as deadly weapons had become fairly common. More details over at about.com.
Toy land-mines have definitely gone out of fashion. Hakes Collectibles explains that the toy was "designed with a trip wire which you were to attach to tree or other stationary object and when wire was bumped, grenade would shoot in the air and cap would fire on base." Also, the toy was "similar to actual weapons used in the Vietnam war."