There are slokas like "subramanya bujangam" in sanskrit. But its created in south india only.
Anyway... the sanskrit book 'AmarakOsam' written by Amarasimman ( who was really a Jain ) is having Murugan in it.
And also Kalidasa a north Indian poet has written "Kumara sambhavam" which describes the birth of Lord Muruga.
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