If one is working on a wall where there may be some past termite damage (now
certainly gone), there is a somewhat "cracking" sound when pounding the
drywall, is there any way to reinforce the studs without having to remove
all the drywall from the walls in question?

In the house in question, the carpet, baseboards and the room itself is in
good enough shape as to not need work, so to re-do all the drywall would be
a massive effort and expense. The state of the studs is unknown, but surely
there's some damage. In a few years, no structural damage was noticed.

The fear is that being a corner room, if the studs are compromised,
eventually the structure could be damaged. Removing the drywall would allow
new PT or metal studs to be inserted.

I'm wondering if there are alternatives. For example, some INJECTABLE
polymer or something, which could be inserted into holes drilled in the
wall, which would fill up any gaps in the studs and strengthen them?

Surely there are solutions none of us have thought of which would prevent
having to take apart the carpet and baseboards etc.

Thanks!