GameTooltip:SetToyByItemID
https://github.com/Gethe/wow-ui-source/blob/live/AddOns/Blizzard_Collections/Blizzard_ToyBox.lua#L139

A new helper will need to be created that will cache the minimal data for every toy in the game and then supply a GetToyInfo method that will retrieve Texture, Name and ItemId for a toy. The latter will be required for SetToyByID.