I've played this game multiple times and I'm almost certain that there is no way to get over the flaming tree without getting caught/slowed down just a little (I've read your reply to someone that it is possible, but the jumping angles that get me over it now doesn't even make sense compared to the ones that should get me over just fine). Jumping at the right time to get slowed down the least when passing over it isn't very initiative as to when I should jump (it's an unfair obstacle in the sense that the frog can clear it just fine from a sprite point of view, but when it comes to hit boxes, it is just weird and unfair). I even used the previous trees to push the frog sprite forward on the screen and the burning trees still get me (when you have three in a row, all of that forward progress gets erased pretty quickly). You're basically taking a gamble every time you try and jump them. It'd be a more fair challenge to just have the normal trees closer together.