Yes, ling is a Scrabble word!

Noun

1. Water chestnut whose spiny fruit has two rather than 4 prongs

2. Common Old World heath represented by many varieties; low evergreen grown widely in the northern hemisphere

3. Elongated marine food fish of Greenland and northern Europe; often salted and dried

4. American hakes

5. Elongate freshwater cod of northern Europe and Asia and North America having barbels around its mouth