If I attach a TM like Technical Machine: Blindside to my Snorlax Doll, can it use its "Blindside" attack?
Yes.
Source: TPCi Rules Team (2023-11-09)

Relevant cards

Note: All applicable cards may not be listed below.
SV4_175
SV4_175
SV4_176
SV4_176
SV4_177
SV4_177
SV4_178
SV4_178
SV4_179
SV4_179