Green and Harrison started the 48-22 win at Newell’s Old Boys, one of Argentina’s top football grounds, while Forsyth came on as a second-half replacement.
Gloucester Rugby centre Jonny May scored a hat-trick, the first of which on 29 minutes was set up by Green’s battering run. Captain Jacob Rowan of Leeds Carnegie and London Wasps win Christian Wade were the other try scorers with the rest of the points coming from the boot of London Irish full-back Tom Homer.
England are next in action on Wednesday, June 9 when they take on Ireland at Newell’s Old Boys. Kick off is at 6.10pm and the game is live on Sky sports and www.irb.com/jwc
England U20s
15 Tom Homer (London Irish)
14 Christian Wade (London Wasps)
13 Jonny May (Gloucester Rugby)
12 Tom Casson (Harlequins)
11 Marcus Watson (London Irish)
10 Freddie Burns (Gloucester Rugby)
9 Sam Harrison (Leicester Tigers)
1 Joe Marler (Harlequins)
2 Arthur Ellis (London Wasps)
3 Shaun Knight (Gloucester Rugby)
4 Calum Green (Leicester Tigers)
5 Charlie Matthews (Harlequins)
6 Will Welch (Newcastle Falcons)
7 Jacob Rowan (Leeds Carnegie)
8 Jackson Wray (Saracens)
Replacements
16 Jamie George (Saracens)
17 Lee Imiolek (Sale Sharks)
18 George Kruis (Saracens)
19 Alex Gray (Newcastle Falcons)
20 Charlie Davies (Stade Francais)
21 Rory Clegg (Harlequins)
22 Andrew Forsyth (Leicester Tigers)
