I think you're talking about a cromach. Here's a description I found from a Clan Campbell site (http://www.ccsna.org/jsep46.htm):

CROMACHS


The long stick with a curved top used by both stockmen and shepherds in Scotland is, on more well dressed occasions such as Highland Games there, used by men with daytime Highland dress. Its use is equally appropriate in North America. The cromach (pron. CROMach, with the `O' as in song) gained popularity in the 20th century and has come into accepted use for the Stewards (or organizers) who run Highland Games in Scotland. But use of the cromach is in no way limited to those in authority. The making of fine cromachs is a craft much admired in Scotland and they are generally made of hazel and sometimes with a horn handle with a carved finial. Some makers bend twigs on the tree and wait years for them to grow thick enough to cut for a cromach with the hook grown in.

There is another style of stick, sometimes seen at Games in North America, which is a twisted or club-like stick. This is properly a shelailagh and is more of Irish than Highland origin and not particularly appropriate to Highlanders unless of `Scots-Irish' ancestry perhaps.