Lisa,
I'm encountering the very same thing right now. The bridge of scar tissue has tethered one side of my tongue to the floor of my mouth. It has had a pronounced effect on my speech which really upset me because my speech was so good after the surgery. My doctor talked to me about releasing it, but he said with it being radiated tissue that it would probably just become scar tissue all over again. He said it's usually not successful. If your doc tells you anything different, please let me know and good luck with it!
Minnie

SCC Left Mandible. Jaw replaced with bone from leg. Neck disection, 37 radiation treatments. Recurrence 8-28-07, stage 2, tongue. One third of tongue removed 10-4-07. 5-23-08 chemo started for tumor behind swallowing passage, Our good friend and much loved OCF member Minnie has been lost to the disease (RIP 10-29-08). We will all miss her greatly.