Hi Steve & welcome,
Please don't apologise, I didn't know what a Frigger was when I joined either :oops:
An object made by a glassworker on his own time. Most friggers were made from the molten glass that remained in the pot at the end of the day. Such glass was considered to be a worker's perquisite.
They come in all different shapes and sizes and were often made to show off the glass makers skills.
(Well that is how I see them anyhow.)