Yes, wrinkle is a Scrabble word!

Verb

1. Gather or contract into wrinkles or folds; pucker

2. Make wrinkles or creases on a smooth surface; make a pressed, folded or wrinkled line in

3. Make wrinkled or creased

4. Become wrinkled or crumpled or creased

Noun

1. A slight depression in the smoothness of a surface

2. A minor difficulty

3. A clever method of doing something (especially something new and different)