Yeah, I remember Army Ants too. While I didn't have any myself, my younger brother had several of them, and they were pretty cool. I was actually considering making a fully articulated Army Ant for one of the past custom contests at Figure Realm (80s Style II maybe)--in particular, I was fixating on doing the blue one carrying the huge bomb on his back, but I was going to make that shell even more ridiculously huge.
If they are small rubber ants cast in single colours and in various poses then I remember them, not sure if I should at my age but if they're the same thing I loved them.