As of now, we do not know. But Megan, that underwent a similar process as Timmy did, in fact, turn into one of the more grotesque mutants in The Forest. And if you watched all of The Forest's ending, you do see Timmy in the future, but there are hints that he is not everything he appears to be. So, for now, we just don't know, but we do know he has not gone the Megan route.