In search of a old movie where a young warrior rides a giant snake

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Guys, i am in search of an old movie and this is what i know about it.

It's a drawn animation from probably the 80s.
I think the movie is set in Africa, where a young boy is fighting against a 'larger then normal' frog with a spear. The fight ends with the boy impaling the frog beneath his mouth, so the frog is leaning on the spear and because of it's weight impales himself.
The boy also rides a giant snake.
Also there is a scene where a big rhino is fighting with a hippo.

I had the movie on VHS in the 80s and it was labels Jungle Boy. But i don't know if this is the right title or this is just made up.

Hope anybody recognize.



That elusive hide-and-seek cow is at it again
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Wow! So this is the one!
I passed by this movie during my Google search for it but saw the poster and thought, nah, this isn't the one.
But it is!