The footage is said to feature a 10-year-old boy who is the son of a US soldier, although this has not been verified.
In the clip the boy, who appears to speak with an American accent, calls the US President a “puppet of the Jews” and says that “the battle will end in your lands”.
The 10-year-old boy claims he has become good friends with another child, 7-year-old Abdullah from the northern Iraqi town of Sinjar, in the region of Iraq that ISIS overran in August 2014, slaughtering thousands of members of the Yazidi sect that the extremists considers to be a devil-worshipping cult.
The boy, believed to be called Yusuf, who emigrated to Syria two years ago with his mother, describes the constant airstrikes against the terrorist organisation ISIS and predicts that the battle will move to American soil.
The video proceeds to show Abdullah speaking to the screen, saying that ISIS took him with them when they “liberated Sinjar.” Abdullah and Yousef are then shown washing each other with water.
The seven-minute film, entitled This Fertile Nation, is said to have been filmed in the Syrian city of Raqqa.
SITE Intelligence Group director Rita Katz posted on her Twitter account: “For #ISIS, children are powerful rhetorical devices until old enough to serve ultimate purpose: fight as soldiers.”
ISIS also released a video praising those involved in the Barcelona attack as well as urging for more to take place.
It is believed it is the first time ISIS have issued a video involving Spanish-speaking fighters.
In the three-minute video called The Conquest of Barcelona, the ISIS members say that the “war against Spain will carry on until the end of the world” unless it ends its coalition with the US.
The film shows gruesome footage from the attacks last week and another ISIS terrorist says to camera: “I ask Allah to accept our brothers from Barcelona.
“Our war against you will carry on until the end of the world.”
The attacks in Barcelona and the seaside resort of Cambrils killed 15 people and left dozens injured.
Terrorists in Barcelona drove into Las Ramblas as it was packed with tourists.
Sager Hussain, from Bradford, was recently sentenced to five years in prison for uploading extremist footage at Leeds Crown Court.
The 39-year-old was found guilty of uploading three videos that supported ISIS to his Google+ account via YouTube.
Hussain, of Bishop Street, was arrested by counter-terror police in January 2016 and charged with three counts of disseminating terrorist publication in August.
Detective Chief Superintendent Clive Wain, head of counter-terror policing in the North East, said: “Sagheer Hussain openly shared videos from a terrorist group over the internet.
“Terrorist groups such as Daesh [Isis] rely heavily on their propaganda being shared online where it is used to radicalise, encourage support and provoke individuals to carry out attacks abroad and in the UK.
“Tackling extremist material is an essential part of protecting the public and preventing offences that incite or encourage acts of terrorism.”