Sure it is. Especially when talking about relative sizes of existing anatomy rather than completely new anatomy.

For example: Women's feet have gotten considerably larger over the past several decades. For example, in the 1960s, the average size was around a 6.5, in the 1970s it was 7.5, and today it's often cited as between 8.5 and 9. That's a whopping 30% (according to Gemini) increase in them whoppers, in my lifetime alone.

I think it's well know also that when there's a certain type of environmental condition that puts different stressors on something evolution can happen only in a few generations. Look it up. There's countless examples of rapid evolution that's well known to happen.