In the purest of form side by side comparison, Astrom("Swedish") vs Doss("American"):
https://www.youtube.com/watch?v=vhQzVIX4cVs&t=1m47s
Pretty much anyone that hops and swings more underneath their body like a pendulum is "Swedish" or mostly Swedish. There are variations of the rear arm and hybrids of both styles, but the forward tilted body/vertical shoulder rotation(golf swing) is mainly used as a longer lever against the arm/wrist. They have silly power on hyzer and will rarely seem them throwing pure anhyzers. Notable mostly Swedes... David Wiggins,
Simon Lizotte, Steve Brinster, Garrett Gurthie, David Feldberg, Kevin Jones, Robbie Bratten, Eric McCabe, Drew Gibson, Will Schusterick, Eagle McMahon, Alex Geisinger, Ken and Marc Jarvis.
"American" or "Bent arm/elbow" is more snappy like a wrist shot vs slap shot is how Blake_T described it. He said Swedish uses more wrist extension while American uses more elbow extension. American uses more redirection/physics trick of the swing while Swedish uses more pure mechanical leverage and has more distance potential. Noteable more Mericans... Nate Doss, and Matt Orum.