[FreeAtlanta]

Thunderbolt I
P-47 aka, the jug

Thunderbolt II
A-10 aka, the Warthog

[PLMerite]

Easier to see here, the original P-47 Tunderbolt models (P-47-A thru early -D variants) had a high spine aft of the cockpit and were called "Razorback" as in "Razorback Hog.":

Later -D models and subsequent variants had the full bubbletop canopy.:

A-10s are called "Hawgs" simply because they're ugly and like to get down in the dirt: