1996 Buick Park Avenue front turn signals do not work, replaced bulbs and fuses for headlamps. could it be the control arm?

It might be the control stalk....or it might be a bad ground up front.

You can test this with a simple test light. Remove one of the bulbs and with the test light grounded touch the test tip to each of the sockets contacts.
If you have the blinkers on then one of the contacts should light the test light. If not, you may have a short before the sockets....which may lead back to your control stalk. It just seems unlikely if your rear signals are still blinking. So the short might be in the harness betweent he lights and the stalk....which is tough since most of the harness is buried in the engine bay.

Good luck and be careful!