no, don't mix. especially cause 99.99% of leaf taileds are WC they will pass whatever pathogens they have onto the RETF. i promise you, both species are plenty interesting by themselves. you don't need both in the same tank.
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RES
WTF
FBT
Russian Tortoise
Hingeback tortoise
Leos
Lawsons Dragon
Aussi
Ocelot Gecko
0.0.3 Vietnamese Mossy Treefrogs
Oregon Newt
Japanese FBN
American Bullfrog
0.0.4 D. tinctorius
D. auratus
D. leucomelas
1.1D. imitator
0.0.2 imitator intermedius
1.1.1D. lamasi
Grandis Day Gecko
Mali Uro
0.0.4 Hourglass Treefrogs
Conehead lizard
Painted Turtle
Hedgehog, bunnies, dog, fish, crawfish...