hi Gail,
on my first trip to the ENT i met a fellow in the waiting room that i believe had a full frontal tongue replacement... his speech was fine and if i hadn't heard him talk about it with his family, i won't have know it wasn't original.
so that left me with a very positive view of how well these proceedures can work. hopefully you will have a similar experience. i think the results can be quite amazing.
cu,
larryb