Goku from the dubbed Variation of Dragon Ball Z sounds like a grown person that has a deep voice but acts like a youngster. While in the Japanese Variation of your anime, Goku sounds like a baby. This was an evident character selection produced by the creators of the show. https://zaneklmmd.worldblogged.com/35720686/the-smart-trick-of-voice-over-online-that-no-one-is-discussing