Turtlèd, Python, 23 bytes
"Treat";print('Trick' )
Produces Treat in Turtlèd, Trick in Python
probably also produces "Treat" in foo
Explanation:
Turtlèd
"Treat" Write Treat
; Move down by register amount. nop as register is 0
print Nops and move right
(' if current cell is ' (it will not be)
Trick' Nops, move right, write a space
) End if
[implicit print grid]
Python
(I can't ideone right now)
"Treat"; comment
print('Trick' ) print "Trick" to output