why some are lake so and so ,and others are ,so and so lake ?

Answer 1

The history of geographic naming is interesting, often in the past things were named in a very casual way. The US Geological Survey maintains a geographic names database, you might be able to look up the history of particular lake names there, or even ask them a question.

Answer 2

depending on the person that named the lake and how they wanted its name to be :D
nothing complicated