Allah bless you
This is rather concerned with Arabic language, and the specific meaning of the words. The difference between “took him by mouth” and "swallow" changes the position of John in the blue whale's body. What is stated in Quran is scientifically right. Another victory for Muslims which makes faith in Allah and Islam stable in their hearts, as Allah the Almighty says:
"The believers are only those who, when Allah is mentioned, their hearts become fearful, and when His verses are recited to them, it increases them in faith; and upon their Lord they rely" - Anfal (2)