is tremedol or hydrocodone a form of darvon?

Tramadol, hydrocodone and Darvon (propoxyphene) are all different painkillers.

Tramadol is a narcotic-like pain reliever. Tramadol is used to treat moderate to severe pain.
see http://www.drugs.com/tramadol.html

Hydrocodone is in a group of drugs called narcotic pain relievers. It is used in combination with other drugs, most commonly acetaminophen.
The combination of acetaminophen and hydrocodone is used to relieve moderate to severe pain.
see http://www.drugs.com/mtm/acetaminophen-and-hydrocodone.html

Darvon (propoxyphene) is also a narcotic pain reliever. Propoxyphene is used to relieve mild to moderate pain.
see http://www.drugs.com/mtm/darvon.html