That's just Krausen. 100% totally absolutely normal. Some beers have more, some have less. A really big one could be a warm fermentation, or just a particularly vigorous one. Your yeast are also a big influencing factor on krausen qualities.
Also, if you weren't pitching enough yeast, fermenting cool, or just using a slower strain of yeast on previous brews, you might not have had as much krausen.
You're good: it looks gross but will eventually subside. That foam is just another sign of fermentation.