Timmy was what we called them, similar context to "Charlie" used during the Vietnam War...
"Think Timmy will come out & play today?"
In the broader context, we also referred to Afghanistan as the sandbox.
Otherwise, I just heard them referred to as "bad guys"
For example, if we were being shown UAV footage prior to a patrol or an OP, any suspected or confirmed Taliban activity was communicated like...
"And here we have some bad guys...walking around doing bad guy stuff..."
And Hajis