Final answer:
The suspect medication is haloperidol.
Step-by-step explanation:
The symptoms described in the question, including acute dysarthria (difficulty in speaking), protruding tongue, and torticollis (twisted neck), suggest the presence of a movement disorder known as acute dystonia. This condition can occur as a side effect of certain medications, particularly antipsychotics. One medication that is often associated with acute dystonia is **haloperidol**.