so how?
That's a glitch with TPT. You can technically have as many heads as you want, as the game would only allow (I think) any STKM to have the same leg/foot points. Same with STK2. If there are multiple STKM on-screen (which is due to a glitch/bug) then they will pull each other to get to the same leg points. ANy more thatn 2 usually leads to STKM weirdness, due to the collisions the heads have with each other. :)
Look at my homepage if you wait long enough a stickman bomb explodes and creates a two headed stickman
!set type xxxx stkm
!set type wood stkm