Northern Praying Mantis is unrelated to Southern Praying Mantis. Some observable differences:

  Northern Praying Mantis Southern Praying Mantis
Origin Northern Shaolin; animal styles; weapons Hakka people; empty-hand combat
Signature Technique mantis claw for grabbing phoenix fist for striking
Forms many forms, with many (e.g., 50-80) movements few forms, with few (e.g., 20 or less) movements
Range mid-to-long range close range
Strikes whipping, circular; long fist circular; high-low; short-range power
Kicks long range (low to high, head level) short-to-medium range (low, at-below waist)
Stances low; open; wide more upright
Footwork complex; sweeping, long steps; sometimes jumpy short steps; narrow angles

If you're looking for Northern Praying Mantis training in Toronto, Ontario, the GTA, Niagara, or Golden Horseshoe areas, here are a few schools that I've Google'd for you.

School Location
Seven Star Praying Mantis Kung Fu Association Toronto, ON
Niagara Kung Fu Academy Niagara Falls, ON
Golden Harmony Martial Arts & Wellness Toronto, ON
Six Degrees Health Toronto, ON
Wu Tan Canada Ottawa, ON
Wu Shen Kung Fu Academy Windsor, ON
Ting Shen Kung Fu London, ON