I think Snug in a Blanket is originally Irish, but it has been popular with Highland pipers for a while now. Scarce o' Tatties was composed by Norman Maclean as the tune to a set of lyrics called Cion a' Bhuntata. He also used the tune as the them to one of his TV series.

This set and other tunes played at the SMG Wednesday Slow Session can be found in The Scottish Slow Session Volume 1, available from my Online Store.