As everyone has said, its a brown...you did the right thing by putting it back in since it would have been too small to keep.
The Caney Fork has special regulations with regard to trout...1 brown can be taken but it must be a minimum of 24 inches long. 5 rainbow or brook trout can be taken but none between 14 and 20 inches (the protected range) and only 1 over 20 inches.
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