DCHP-1 Online
hummock(ed) ice 
See hummock (def. 2) quotes.
See also: hummock (def. 2)
- 1855 (1892) . . . this will prevent her rocking and pitching when crossing hummocked ice, and enable us to cradle her firmly to the sled.
- 1937 . . . they had a good load to haul over a long stretch of hummock ice which fronted the shore. . . .
- 1954 HUMMOCK ICE is result of marginal crushing, which heaps up the ice.
- 1855 (1892) . . . this will prevent her rocking and pitching when crossing hummocked ice, and enable us to cradle her firmly to the sled.