He's growing up. He's going through puberty. Everyone goes through puberty. It's the process of change in a person's body, voice, and other things.
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Speaking voice: Jonah Bobo (season 1-4) Singing voice: Thomas Sharkey (season1-3) Speaking voice:Nicholas Branch (season 4)
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That is season 6th first episode iGot Jungle Worms.
As of the forth season, he is about 15 or 16. The actor who plays Freddie, Nathan Karl Kress, is 18
Like he said - Puberty. It was a bit weird how it suddenly changed.