There don’t appear to be any fritzing parts around (a google search for “frtizing part RobotDyn SAMD21 Mini” comes up with several boards but no fritzing part.) If you have the Sparkfun one there are probably eagle files available which makes things easier somewhat. If you want to make your own part these tutorials are for the 0.9.3b version of fritzing (most of the others are for older versions):
Parts making is quite complex, but feel free to ask for help and/or for one of us to make a part (although we would need to know which particular board you want.)