We don't have synonyms for bottine yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are botting, bottini and bottone.
(n) :
An appliance resembling a small boot furnished with straps, buckles, etc., used to correct or prevent distortions in the lower extremities of children.
(n) :
An appliance resembling a small boot furnished with straps, buckles, etc., used to correct or prevent distortions in the lower extremities of children.