This is called "anchor ice". I just looked it up because the rivers in Missoula have been doing this, this winter. Looking up the term anchor ice will get you some good pictures. There is a great pdf of anchor ice in the roaring fork valley (Colorado) that explains how it forms.

No. Anchor Hocking made a 6 sided one. It is shaped like their Wexford Ice bucket and cookie jar.

LampLight Farms made the round one.

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The cast of Business World News - 2003 includes: Mark Bedor as Anchor Debbie Dujanovic as Anchor James Earl Jones as Spokesperson Penny Griego as Anchor Kyla Grogan as Anchor Joyce Harvey as Anchor Amy Hendel as Anchor Marti Johnson as Anchor Mark Kriski as Anchor Mario Machado as Anchor Berit Mason as Anchor Norm McBride as Anchor Lynette Romero as Anchor Karina Rusk as Anchor Tamara Taggart as Anchor Teresa Tanoos as Anchor