To tame a spino you need about 4-5 tranq darts, you can tame a lvl 10 spino with 2 darts and an raptor, use the raptor to rush the spino and tranq it once, it will agro, so run away, then go back and dart it again and it is knocked. To find they are most active at beaches or any place with water, you can find 1 in a beach, 10 in those water fall type of valleys.