Found a Japanese maple (?) seedling in my tomato container – Reddit Post

I just potted my tomato plants and marigold into grow bags 3 days ago and today I found this seedling in one of the grow bags. Google says it’s a Japanese maple (we have 3 Japanese maple trees in our yard). Is it possible for it to grow to that size in just 3 days, or is it something else? When should I transplant it if it is indeed Japanese maple?