I’ve placed at least 3 geckos, and 6 or so anoles over the years. They all eventually disappear. Oh, and it was rainbowmealworms.com, forgot the name for a moment.
When I tried giving a gecko to my Jackson´s, she got all excited when she saw the tweezers, but it was to small, so she could not figure out where to shoot her tongue. I feel´t bad so I gave some roaches instead.