Enables Wnt-activated receptor activity. Involved in several processes, including bone regeneration; negative regulation of skeletal muscle acetylcholine-gated channel clustering; and positive regulation of bone mineralization. Acts upstream of or within B cell differentiation; learning or memory; and neuroblast proliferation. Located in filopodium membrane and perinuclear region of cytoplasm. Is expressed in several structures, including central nervous system; embryo mesenchyme; gonad; sensory organ; and skeleton. Used to study Williams-Beuren syndrome. Orthologous to human FZD9 (frizzled class receptor 9). [provided by Alliance of Genome Resources, Apr 2022]