Found in the following dictionaries
OTCWL2014 (NASPA Word List 2014)
"Olallieberry" Definition
noun
A hybrid berry with a tart taste created by crossing a loganberry and a youngberry.
Source: Wiktionary
A blackish berry that is a hybrid of a loganberry and youngberry, resembles an elongated blackberry, and is grown chiefly along the western United States coast.
Source: Merriam-Webster
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