Is there such thing as a purple pickle?

i searched it up but nothing. but there were things related to it like mr pickleberry

Pickleberry was the term coined by Linda Arnold in 1985 for the whimsical creatures who inhabit an imaginary pie on her kitchen counter. The three creatures, Peter, Tony, and Pammie, were popular in a nationwide public radio program for children, "Pickleberry Pie" for 13 years. Programs can still be heard around the country, including online at kidspublicradio.org

Pickleberry Pie Inc., started by Linda Arnold and PJ Swift, does many good works around the US, including free concerts for children in hospitals.