This is virtually impossible since so much of Labour's support is in central belt seats (esp. Glasgow) where the SNP has large majorities. Labour are favourites to hold Edinburgh South, their lone seat, but much beyond that would be very unexpected.
Meanwhile there are a lot of seats that the bookies have down as SNP/Tory marginals: East Renfrewshire, Aberdeen South, West Aberdeenshire & Kincardine, Moray, Perth & North Perthshire, Edinburgh South West, Edinburgh North & Leith, Dumfriesshire, Clydesdale & Tweeddale, East Lothian (though this is a 3-way with Labour in the mix too). Even in Angus the Tories are priced at 2/1, and in Banff & Buchan they are 5/2. Compare Labour in Glasgow South (my seat): 16/1. Berwickshire, Roxburgh & Selkirk and Dumfries & Galloway are regarded as safe seats for the Tories so I didn't list them.
Don't the Tories have one seat too? With the up surge in Labour, doesn't the trend suggest a Labour gain and SNP loss?